Rocky Road Sheet Cake

Rocky Road Sheet Cake is a moist homemade chocolate sheet cake topped with melty marshmallows, rich chocolate frosting, and chopped almonds!

Course Dessert

Cuisine American

Prep Time 15

Cook Time 25

Total Time 40

Servings servings

Calories 285kcal

Preheat oven to 350 F. Grease a rimmed cookie sheet (I use a 15x11-inch). Set aside.
Melt butter in a large saucepan.
½ cup butter
Once butter has melted, stir in water and cocoa powder; bring to a boil.
¼ cup unsweetened cocoa powder, 1 cup water
Once at a boil, add buttermilk, and stir to combine.
½ cup buttermilk
Remove pan from heat.
Add the yogurt, eggs, and vanilla, and stir until well-combined.
¼ cup plain Greek yogurt, 2 large eggs, 1 teaspoon vanilla extract
Stir in sugar, flour, baking soda, and salt until just combined.
1 cup granulated sugar, 2 cups all-purpose flour, 1 teaspoon baking soda, ½ teaspoon salt
Bake for 15-20 minutes.
While the cake is baking prepare the icing.
For the icing, combine the butter, cocoa, and buttermilk. Bring to a boil.
½ cup butter, ½ cup cocoa powder, ⅓ cup buttermilk
Remove from heat, and add the powdered sugar, vanilla, and half of marshmallows. Stir to combine.
3 cups powdered sugar, 1 teaspoon vanilla, 10 ounce package mini marshmallows
Sprinkle remaining half marshmallows over hot cake.
Pour icing over hot cake, and spread evenly over cake.
Sprinkle with chopped almonds.
1 cup chopped almonds

Butter: I use salted butter in this recipe. If using unsalted butter, increase the salt in the cake to 3/4 teaspoon and add 1/4 teaspoon salt to the frosting.
Cocoa powder: I use unsweetened cocoa powder, not Dutch-processed cocoa powder, in this recipe.
Buttermilk: Regular or low-fat will work. You can make your own buttermilk substitute with this recipe.
Greek yogurt: I use fat-free. You could also use 2% or full-fat yogurt or full-fat sour cream.
Powdered sugar: If your powdered sugar is lumpy, sift it before you add it to the frosting. This will help the powdered sugar to better incorporate into the frosting so that you don't end up with lumpy frosting.
Almonds: I use unsalted roasted almonds.
Nutrition facts are estimated.