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Rocky Road Sheet Cake

This Rocky Road Sheetcake is going to take your sheet cake game to a whole new level.  Deliciously moist sheet cake, cooked to perfection and topped with an ooey gooey mixture of marshmallows, chocolate, and cashews.  
Prep Time20 mins
Cook Time25 mins
Total Time45 mins
Course: Dessert
Cuisine: American
Keyword: Rocky Road Sheet Cake
Servings: 12
Author: Amanda Rettke


Chocolate Cake


    • 1/3  cup  (67g) brown sugar
    • 1/3  cup  strong coffee
    • 1/2  cup  (50g) dark cocoa (or dutch process)
    • tablespoon  butter
    • teaspoon  vanilla


    • 1 1/2  cups  (192g) all-purpose flour
    • 1/2  teaspoon  baking powder
    • teaspoon  baking soda
    • 1/2  cup  (113g) salted butter,  warm but not melted
    • 1/2  cup  (100g) granulated sugar
    • 1/2  cup  (100g) packed brown sugar
    • large eggs,  room temperature
    • 1/2  cup  cold coffee
    • teaspoon  vanilla

    Rocky Road Topping

    • 1/2  cup  (1 stick or 113g) butter
    • 1/2  cup  (50g) cocoa powder
    • 1/3  cup  (82g) buttermilk
    • cups  (375g) confectioners sugar
    • teaspoon  vanilla
    • 1 bag  (10 ounces) mini marshmallows
    • cup  chopped cashews


    Chocolate Cake


      • Preheat oven to 350 degrees.
      • Place all ingredients in the first part into a saucepan over low heat. Stir until they are fully incorporated, 5-7 minutes. Remove from heat and allow to cool a bit. It should be a little thick and similar to custard.


      • In a medium bowl, sift flour, baking soda, and baking powder together.
      • Add 1/2 cup warm butter, sugars, eggs, cooled coffee, and vanilla to the flour mixture and mix with a hand-held mixer until fully combined. (or stir by hand)
      • Add the chocolate mixture from the FIRST PART to the ingredients from the SECOND PART. Stir by hand until all ingredients are well combined.
      • Pour onto a prepared (sprayed or lined with parchment) baking sheet (I used a 10x15in baking sheet). Smooth out the batter and gently tap on the counter.
      • Bake in a 350°F oven for 16-22 minutes, or until the center no longer appears wet and an inserted toothpick is removed with a few crumbs.

      Rocky Road Toppings

      • While the cake is baking combine the butter, cocoa, and buttermilk and bring to a boil.
      • Remove from heat, and add the powdered sugar, vanilla, and half of the marshmallows. Stir to combine.
      • Sprinkle remaining half marshmallows over hot baked cake
      • Pour icing over hot cake, it should spread itself out evenly over cake.
      • Sprinkle with chopped Cashews.


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