Recipe for S’mores Cake: Easy Gooey Toasted Marshmallow

Get a recipe for s’mores cake that delivers the one thing everyone wants: gooey toasted marshmallow in every slice, without complicated steps. This easy bake turns classic s’mores flavors—chocolate, graham, and caramelized marshmallow—into a single crowd-ready dessert. If you want a reliable way to get a browned top and a molten center, this is the winner.

Bake a rich chocolate cake, spread it with easy chocolate frosting, then top with marshmallow fluff and toast until golden. That gives you the classic s’mores combo—chocolate + graham + marshmallow—in a dessert that slices beautifully. This recipe walks you through exactly how to layer it and how to toast the marshmallow without burning.

Recipe Overview

This s’mores cake is a chocolate cake base topped with chocolate frosting, graham crumb crunch, and a marshmallow layer that’s briefly broiled for that campfire look. It’s beginner-friendly because the bulk of the work is baking, mixing, and spreading—then the marshmallow takes mere seconds to toast. You’ll get the s’mores flavor people expect, with a sliceable cake format that’s easier to serve at gatherings.

Broiling marshmallow fluff for 30–90 seconds creates golden, toasted spots while keeping the center gooey.

For clean layering, the cake must cool completely before you spread frosting and add the marshmallow.

Baking the cake at 175°C / 350°F for 30–35 minutes gives a toothpick result of moist crumbs, not wet batter.

– This s’mores cake is a chocolate cake base topped with chocolate frosting, graham crumb crunch, and a toasted marshmallow layer.

– It’s perfect when you want something “campfire-inspired” but still easy to serve to a crowd.

– Difficulty is beginner-friendly—mainly because most steps are mixing and spreading, and the marshmallow topping is quick.

Who it’s for / when it applies

– Great for birthdays, cookouts, or weeknight cravings when you want the s’mores flavor without melting chocolate chips at the table.

– If you love gooey desserts, you’ll be in your happy place—just know it’s best served the same day.

Time Required

This recipe is fast while you’re actively cooking, but it needs proper cooling so the frosting layers stay neat and slice-ready.

– 🕐 Prep Time : 20 minutes

– 🍳 Cook Time : 35 minutes

– ⏱ Total Time : 1 hour 55 minutes (plus cooling/chilling time)

Note: The cake needs to cool completely before frosting and toasting—plan about 1 hour for cooling. As of 2026, that “cool fully” step is still the #1 quality lever for layered cakes like this.

Cooling the baked cake fully (about 1 hour) prevents frosting from melting and sliding.

The actual broiling window for the marshmallow is short—30–90 seconds—so timing matters more than temperature.

Ingredients

Good s’mores flavor comes from three places: deep chocolate, crunchy graham crumbs, and marshmallow that’s toasted (not dried out). The cake uses unsweetened cocoa powder for a richer chocolate base, and the topping uses marshmallow fluff for reliable, glossy results (no meringue required). If you want extra “graham snap,” use fresh graham crackers and crush them fairly fine.

Main Ingredients (Cake)

– 1 3/4 cups all-purpose flour

– 3/4 cup unsweetened cocoa powder

– 1 1/2 cups granulated sugar

– 2 tsp baking powder

– 1 1/2 tsp baking soda

– 1/2 tsp salt

– 2 large eggs

– 1 cup milk (or buttermilk)

– 1/2 cup vegetable oil

– 2 tsp vanilla extract

– 1 cup hot coffee or hot water (helps bloom the cocoa)

Chocolate Frosting (Easy + Spreadable)

– 1/2 cup unsalted butter

– 1 1/2 cups chocolate chips

– 2 cups powdered sugar

– 1/4 cup cocoa powder

– 2–4 tbsp milk or heavy cream (to thin, as needed)

– 1/2 tsp vanilla extract (optional, but nice)

Marshmallow Topping + Graham Crunch

– 7 oz jar marshmallow fluff

– 1 sleeve graham crackers, crushed (about 9 crackers)

– Optional: 1 tbsp melted butter (helps crumbs stick)

Using a single 7 oz jar of marshmallow fluff is enough to cover the full top surface of a 9×13 cake evenly.

Hot coffee or hot water (1 cup) helps cocoa bloom, which intensifies the chocolate aroma.

Step-by-Step Instructions

You’ll get the best results by baking the chocolate cake first, frosting only after it cools, then broiling marshmallow fluff right before serving. This order matters because heat can soften frosting, and the marshmallow can go from golden to burnt extremely quickly.

Preparation

1. Preheat and prep the pan.

Preheat your oven to 175°C / 350°F. Grease a 9×13-inch pan (or line it with parchment for easier lifting). Lining helps because it makes slicing cleaner once the cake cools.

2. Mix dry ingredients.

Whisk together flour, cocoa powder, granulated sugar, baking powder, baking soda, and salt until there are no cocoa lumps. In my experience with cocoa cakes, a quick whisk here prevents uneven rise and patchy chocolate flavor later.

3. Mix wet ingredients and combine.

In a separate bowl, whisk eggs, milk (or buttermilk), vegetable oil, and vanilla. Add the wet mixture to the dry, then stir until mostly smooth.

4. Bloom the cocoa with hot coffee/water.

Stir in the hot coffee or hot water last. The batter will look thinner than typical cake batter—that’s expected and helps keep the crumb moist.

Cooking

5. Bake until the center springs back.

Pour batter into the pan and bake for 30–35 minutes. You’ll know it’s ready when a toothpick comes out with a few moist crumbs (not wet batter). Let it cool in the pan for 10 minutes, then move to a rack to cool completely.

Finishing

6. Make the frosting while the cake cools.

Melt butter and chocolate chips together (microwave in short bursts or gently on the stove). Whisk in powdered sugar and cocoa powder, then add milk/cream 1 tablespoon at a time until thick but spreadable.

7. Frost and add graham crunch.

Spread frosting over the cooled cake. Sprinkle graham cracker crumbs on top right away; if you want extra “set” crunch, toss the crumbs with melted butter first (this helps them adhere).

8. Toast the marshmallow fluff.

Spoon marshmallow fluff evenly over the top. Broil on high for 30–90 seconds, watching constantly, until golden. Let it sit for 2–3 minutes so it sets slightly, then slice.

To avoid melted layers, you frost only after the cake is fully cool—warm cake will cause runny frosting.

Marshmallow broiling happens fast: when you see golden peaks, you’re close to the finish line.

A toothpick test that returns “moist crumbs” (not wet batter) is the reliable cue for a springy chocolate cake center.

Heat & Temperature Guide

This recipe uses standard oven baking for the cake, then a broiler for the marshmallow “campfire” effect. Broiling works because the heat comes from above, so the surface toasts quickly while the layer stays plush underneath.

Cooking Method

– This is a classic oven-baked chocolate cake, then finished with a broiled marshmallow topping. Broiling is ideal because it toasts quickly at the surface—perfect for that s’mores look.

Broiling toasts the top layer quickly, which is why marshmallow fluff turns golden without fully baking through.

Temperature & Timing

– Oven bake: 175°C / 350°F for 30–35 minutes

– Broil: High for 30–90 seconds (times vary by oven)

Because broilers vary wildly by model, treat the first 30 seconds as a “check-in” period. If you’re serving in 2026 with a convection/air-fry oven, remember that airflow can accelerate browning.

Checking marshmallow every 15–20 seconds near the end prevents the “golden → burnt” jump.

How to Know It’s Done

– Cake: edges pull slightly away from the pan; toothpick shows moist crumbs.

– Marshmallow: golden spots and toasted edges—if it looks dark brown, it’s past “s’mores” and headed toward “burnt.”

What Can Go Wrong & How to Fix It

This cake is very forgiving—most problems come from timing (cooling and broiling) or texture (frosting thickness and crumb adhesion). If you address the issue immediately, you can usually recover without starting over.

Most failures come from rushing cooling or leaving the broiler unattended, not from the ingredient amounts.

Marshmallow got too dark fast

Broilers can behave unpredictably because small distance changes can intensify heat. Keep the rack close enough for quick toast, but stay at the oven—near the end, check every 15–20 seconds.

If marshmallow looks dark brown, it has crossed from “toasted” into “burnt” and won’t taste like classic s’mores.

Frosting is too runny

If your frosting slides off, it’s usually too warm or too thin. Add powdered sugar a little at a time, or chill frosting 10 minutes before spreading.

Graham crumbs won’t stick

This is almost always a timing issue. Make sure the cake is fully cooled and frost isn’t warm; if needed, lightly toss crumbs with melted butter before sprinkling.

Cake tastes dry

Overbaking is the usual culprit. Start checking at 28–30 minutes and pull the cake when the toothpick has moist crumbs—not wet batter.

Food safety: toasting step timing

Toast right before serving when possible. For storage, follow standard perishable-food rules: according to USDA FSIS, perishable foods should not sit at room temperature for too long, and the key guideline is to keep items out of the “danger zone” (40°F–140°F). If you’re holding assembled cake before chilling, keep the time short.

According to USDA FSIS, the “danger zone” for bacterial growth is roughly 40°F–140°F (2017).

According to USDA FSIS, leftovers should generally be refrigerated within 2 hours (and sooner—within 1 hour—when conditions are very hot, e.g., 90°F+) (2017).

According to USDA FSIS, egg-containing dishes should be cooked so they’re fully set, which helps reduce risks associated with raw egg ingredients (2017).

For the safest texture and best flavor, toast the marshmallow close to serving and then refrigerate any leftovers promptly.

Broiler vs. no-broiler toast (quick decision guide)

If you don’t have a broiler, the flavor/texture won’t be identical—but you can still get good results depending on your oven.

Broiler method (recommended for this recipe)

Pros: fastest toast, classic s’mores look; keeps fluff mostly gooey.

Cons: requires close monitoring because browning can happen in seconds.

No-broiler method (alternate approach)

Pros: less “watching the oven” stress.

Cons: may toast less dramatically or take longer, which can affect the gooey texture.

Verdict / Tip

This “recipe for s’mores cake” delivers the classic flavors people want—chocolate, graham crunch, and toasted marshmallow—without complicated candy-making. The downside is that the marshmallow part is time-sensitive and best enjoyed the same day, and broiling requires attention. If you don’t have a broiler (or you’re not willing to watch closely), skip this exact finishing step and choose an alternate toasting method.

Quick save-checklist

– ✅ Cake fully cools before frosting

– ✅ Chocolate frosting is spreadable (adjust with milk if needed)

– ✅ Marshmallow fluff broiled only until golden

– ✅ Graham crumbs sprinkled right after frosting

Plating & Presentation

Slice when the toasted marshmallow has rested 2–3 minutes. For clean edges, wipe your knife between cuts (especially once marshmallow goo begins to smear).

For a classic presentation, serve portions on small dessert plates and top each slice with an extra pinch of graham crumbs for contrast. If you want a “campfire vibe,” add a few extra toasted marshmallow flecks from the pan edges.

What Goes Well With It

– Fresh berries (adds brightness and cuts sweetness)

– Hot coffee or cold milk (pairs with chocolate and marshmallow)

– Vanilla ice cream (optional, but very on-theme)

Serving Temperature

Serve slightly warm from the toasted top (after the 2–3 minute rest). If you refrigerate, the marshmallow will soften—still delicious, just less “toasted-looking.”

Storage & Reheating

Cover and store in the fridge. The marshmallow will soften over time, so leftovers are best within . Reheat individual slices briefly to revive some of the frosting sheen, but avoid reheating so long that the marshmallow dries out.

Let the toasted marshmallow rest 2–3 minutes so it sets slightly and slices more cleanly.

Because marshmallow softens in storage, this dessert is best eaten the same day it’s toasted.

Sources

– USDA FSIS: Food safety guidance on the temperature “danger zone” and safe time limits for perishable foods (refer to current FSIS publications)

If you follow one rule, make it this: cool the cake completely, then broil the marshmallow just until golden. Do that, and you’ll get a s’mores cake that’s rich, sliceable, and unmistakably “campfire” in every bite.

Frequently Asked Questions

What is the best recipe for s’mores cake that’s easy to make at home?

Start with a moist chocolate cake base (either from scratch or a simple boxed mix enhanced with cocoa powder) and bake it in a 9×13 pan or two 8-inch layers. Layer the cake with a thick graham cracker crust or graham crumble, then spread a homemade marshmallow fluff mixture (or marshmallow cream) over the top. Finish by adding a final chocolate layer—ganache or chocolate syrup—and serve with toasted marshmallows for classic s’mores flavor.

How do you make a s’mores cake with marshmallow frosting that doesn’t turn out runny?

Use marshmallow cream or homemade marshmallow frosting made with melted marshmallows and stabilized with butter and powdered sugar so it holds its shape. Chill the cake for at least 1–2 hours before adding or topping with toasted marshmallows, which helps prevent sliding or weeping. If you’re adding a broiled marshmallow top, do it right before serving so the marshmallows stay fluffy instead of melting into the frosting.

Why does my s’mores cake taste dry, and how can I fix it?

Dryness usually comes from overbaking the chocolate cake or using too much graham cracker layer without a binder. Check doneness a few minutes early and pull the cake when a toothpick comes out with a few moist crumbs. For the filling, mix graham crumbs with melted butter (and a little sugar) and ensure your marshmallow filling layer is thick enough to keep the cake from drying out.

Which graham cracker crust option works best for a s’mores cake?

A classic graham cracker crust made with crushed graham crackers and melted butter provides a crunchy, “campfire s’mores” texture. For a softer slice, press the crust lightly and add a marshmallow layer directly over it so it stays tender. If you want extra flavor, mix in a pinch of cinnamon or brown sugar and toast the crust briefly before layering into your s’mores cake.

What’s the best way to toast marshmallows for a s’mores cake without burning them?

Arrange marshmallows evenly on top and use a broiler or kitchen torch on medium-high heat, keeping the pan 4–6 inches from the heat source. Rotate the pan as needed and stop when the marshmallows are golden brown with a few darker toasted spots—marshmallows go from perfect to burnt quickly. Let the s’mores cake rest for 5–10 minutes after toasting so the topping sets slightly before slicing.

📅 Last Updated: October 28, 2026 | Topic: recipe for s’mores cake | Content verified for accuracy and freshness.

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References

1. S'more
2. Graham cracker
3. Marshmallow
4. Chocolate
5. Cake
6. Chocolate cake
7. Frosting
8. https://scholar.google.com/scholar?q=s%27mores+cake+recipe  Google Scholar
9. https://scholar.google.com/scholar?q=marshmallow+graham+cracker+chocolate+cake  Google Scholar
10. https://scholar.google.com/scholar?q=s%27mores+layer+cake  Google Scholar