Valentine's Day S'mores Cake

Highlighted under: SugarAlchemy Kitchen

I love combining the cozy indulgence of s'mores with a festive twist for Valentine's Day, and this cake is the perfect way to do it. Each layer is rich with chocolate, sweetened with gooey marshmallow, and balanced by a hint of graham cracker crunch. Preparing this cake in a few stages lets the flavors meld beautifully, creating an unforgettable dessert. It’s a fun and delicious project that brings a smile to everyone’s face, making it an ideal treat for sharing with loved ones on this special day.

Rafael

Created by

Rafael

Last updated on 2026-01-18T16:38:28.059Z

When I was developing this Valentine's Day S'mores Cake, I wanted to capture all the cozy elements of a classic campfire treat while making it celebration-worthy. I found that using layers of moist chocolate cake with marshmallow frosting provided a delightful texture contrast that feels indulgent yet nostalgic. The graham cracker crust adds a pleasant crunch, tying the whole cake together beautifully.

One tip I learned was to carefully toast the marshmallow frosting just before serving; it adds a wonderful smoky flavor that enhances the overall taste. Trust me, it’s this small step that transforms the cake from good to extraordinary!

Why You'll Love This Recipe

  • Rich chocolate flavor paired with fresh marshmallow sweetness
  • Layers of fluffy cake and crunchy graham crackers for that classic s'mores vibe
  • A beautiful centerpiece for your Valentine's Day celebration

Perfecting the Cake

When preparing the cake batter, it's crucial to mix your dry ingredients thoroughly before adding the wet ones. This ensures an even distribution of the baking powder and cocoa, which are vital for a light and fluffy cake. If your batter appears too thick, consider adding a bit more boiling water to achieve a smoother consistency. The boiling water helps dissolve the cocoa better and brings out its rich flavor.

A common pitfall when baking cakes is overmixing, which can lead to a dense texture. Mix until just combined after adding the wet ingredients. Also, using room temperature eggs and milk can help create a more homogenous batter, which promotes even rising and moisture retention during baking, resulting in a cake that's soft yet rich.

Marshmallow Frosting Magic

Crafting the marshmallow frosting requires a delicate touch. When beating the butter, ensure it’s softened to room temperature; this will allow for better incorporation of the powdered sugar. Gradually adding the sugar prevents the frosting from becoming grainy. If your frosting is too thick, a little extra heavy cream can help loosen it up, making it easier to spread and giving it an airy texture.

Folding in mini marshmallows adds delightful pockets of gooeyness that contrast beautifully with the fluffy frosting. To avoid deflating the frosting, use a gentle hand and a spatula for the folding process. If you're short on time, you can chill the frosting slightly to make it easier to work with as you assemble your cake, but be sure to let it soften again before running to frost the entire cake.

Serving and Storing Tips

When it comes time to serve your S'mores cake, consider slicing it after allowing it to cool completely at room temperature. This helps the frosting set and makes for cleaner slices. A large serrated knife works best for cutting through the layers, maintaining the integrity of the cake and frosting layers. For an extra splash of flavor, serve with a drizzle of chocolate syrup or a side of whipped cream.

If you have leftovers, storing the cake should be done properly to maintain its freshness. Cover it with plastic wrap or store it in an airtight container at room temperature for up to three days. Alternatively, you can freeze the cake for longer storage by wrapping individual slices in plastic wrap and placing them in a freezer-safe container. To thaw, leave them at room temperature for a few hours; the frosting will regain its delightful fluffiness.

Ingredients

Gather the following ingredients to bake this delightful cake:

For the Cake:

  • 2 cups all-purpose flour
  • 2 cups granulated sugar
  • 3/4 cup unsweetened cocoa powder
  • 2 teaspoons baking powder
  • 1 1/2 teaspoons baking soda
  • 1 teaspoon salt
  • 2 large eggs
  • 1 cup whole milk
  • 1/2 cup vegetable oil
  • 2 teaspoons vanilla extract
  • 1 cup boiling water

For the Marshmallow Frosting:

  • 1 cup unsalted butter, softened
  • 4 cups powdered sugar
  • 1/2 cup heavy cream
  • 1 teaspoon vanilla extract
  • 2 cups mini marshmallows
  • 1/4 cup graham cracker crumbs

For Assembly:

  • Additional graham cracker crumbs for topping
  • Chocolate bars for garnish

Make sure to have all the ingredients ready before you start baking!

Instructions

Follow these steps to create your cake:

Prepare the Cake Batter

Preheat your oven to 350°F (175°C). In a large bowl, mix together the flour, sugar, cocoa powder, baking powder, baking soda, and salt. Add eggs, milk, oil, and vanilla.

Mix until smooth, then stir in the boiling water.

Bake the Cakes

Pour the batter evenly into two greased 9-inch round cake pans. Bake for 30-35 minutes or until a toothpick inserted in the center comes out clean. Allow to cool in the pans for 10 minutes before transferring to wire racks.

Make the Marshmallow Frosting

While the cakes cool, beat the butter until creamy. Gradually add the powdered sugar, then mix in the heavy cream and vanilla until fluffy. Gently fold in mini marshmallows and graham cracker crumbs.

Assemble the Cake

Once the cakes are completely cooled, place one layer on a serving plate. Spread a layer of marshmallow frosting on top, then place the second layer of cake on top and frost the entire cake.

Add Finishing Touches

Sprinkle additional graham cracker crumbs on top of the frosted cake and garnish with chocolate bars. For an extra touch, toast the marshmallow frosting under a broiler for a few seconds until golden.

Enjoy your delicious Valentine's Day S'mores Cake!

Pro Tips

  • For the best texture, ensure all ingredients are at room temperature before mixing. Additionally, to keep the cake moist, cover any leftovers with plastic wrap.

Ingredient Insights

Using high-quality unsweetened cocoa powder is key to achieving a rich chocolate flavor. Brands like Valrhona or Ghirardelli provide a depth of taste that enhances the overall experience of the cake. If you prefer a less intense chocolate flavor, you can substitute half of the cocoa powder with all-purpose flour, which will still yield a deliciously chocolatey cake without overpowering the other flavors.

The choice of vegetable oil rather than butter for the cake batter contributes moisture and helps the cake stay fresh longer. If you wish to substitute, canola oil or melted coconut oil are excellent alternatives, both providing a similar texture and flavor without the richness of butter.

Variations to Try

This S'mores cake can be easily adapted for different dietary needs. To make it gluten-free, swap out the all-purpose flour for a 1:1 gluten-free baking flour blend, but ensure it includes xanthan gum for structure. For a dairy-free version, substitute the butter and milk with plant-based alternatives, like coconut milk and vegan butter, maintaining the cake's delightful moisture and flavor.

For those who love extra texture, consider adding a layer of chocolate ganache between the cake layers or drizzling it on top before adding the marshmallow frosting. Not only does this heighten the chocolate richness, but it also adds an elegant touch that will impress your loved ones.

Questions About Recipes

→ Can I use store-bought frosting?

Yes, feel free to use store-bought marshmallow or chocolate frosting if you're short on time!

→ How do I store leftovers?

Store the cake in an airtight container at room temperature for up to 3 days.

→ Can I make this cake ahead of time?

Absolutely! You can bake the layers a day ahead and frost right before serving.

→ What can I substitute for eggs?

You can use 1/4 cup of applesauce or a flax egg as a substitute for each egg in the recipe.

Valentine's Day S'mores Cake

I love combining the cozy indulgence of s'mores with a festive twist for Valentine's Day, and this cake is the perfect way to do it. Each layer is rich with chocolate, sweetened with gooey marshmallow, and balanced by a hint of graham cracker crunch. Preparing this cake in a few stages lets the flavors meld beautifully, creating an unforgettable dessert. It’s a fun and delicious project that brings a smile to everyone’s face, making it an ideal treat for sharing with loved ones on this special day.

Prep Time30 minutes
Cooking Duration40 minutes
Overall Time1 hour 10 minutes

Created by: Rafael

Recipe Type: SugarAlchemy Kitchen

Skill Level: Intermediate

Final Quantity: 12 servings

What You'll Need

For the Cake:

  1. 2 cups all-purpose flour
  2. 2 cups granulated sugar
  3. 3/4 cup unsweetened cocoa powder
  4. 2 teaspoons baking powder
  5. 1 1/2 teaspoons baking soda
  6. 1 teaspoon salt
  7. 2 large eggs
  8. 1 cup whole milk
  9. 1/2 cup vegetable oil
  10. 2 teaspoons vanilla extract
  11. 1 cup boiling water

For the Marshmallow Frosting:

  1. 1 cup unsalted butter, softened
  2. 4 cups powdered sugar
  3. 1/2 cup heavy cream
  4. 1 teaspoon vanilla extract
  5. 2 cups mini marshmallows
  6. 1/4 cup graham cracker crumbs

For Assembly:

  1. Additional graham cracker crumbs for topping
  2. Chocolate bars for garnish

How-To Steps

Step 01

Preheat your oven to 350°F (175°C). In a large bowl, mix together the flour, sugar, cocoa powder, baking powder, baking soda, and salt. Add eggs, milk, oil, and vanilla. Mix until smooth, then stir in the boiling water.

Step 02

Pour the batter evenly into two greased 9-inch round cake pans. Bake for 30-35 minutes or until a toothpick inserted in the center comes out clean. Allow to cool in the pans for 10 minutes before transferring to wire racks.

Step 03

While the cakes cool, beat the butter until creamy. Gradually add the powdered sugar, then mix in the heavy cream and vanilla until fluffy. Gently fold in mini marshmallows and graham cracker crumbs.

Step 04

Once the cakes are completely cooled, place one layer on a serving plate. Spread a layer of marshmallow frosting on top, then place the second layer of cake on top and frost the entire cake.

Step 05

Sprinkle additional graham cracker crumbs on top of the frosted cake and garnish with chocolate bars. For an extra touch, toast the marshmallow frosting under a broiler for a few seconds until golden.

Extra Tips

  1. For the best texture, ensure all ingredients are at room temperature before mixing. Additionally, to keep the cake moist, cover any leftovers with plastic wrap.

Nutritional Breakdown (Per Serving)

  • Calories: 380 kcal
  • Total Fat: 26g
  • Saturated Fat: 15g
  • Cholesterol: 195mg
  • Sodium: 85mg
  • Total Carbohydrates: 32g
  • Dietary Fiber: 3g
  • Sugars: 24g
  • Protein: 6g