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A chocolate dessert bar topped with mini marshmallows and nuts on a white plate, with a tray of similar bars and a red checkered cloth in the background.
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Rocky Road Texas Sheet Cake

A chocolate lover’s dream with fudgy cake, gooey marshmallows, and crunchy nuts. This version of the classic Texas sheet cake feeds a crowd and brings the wow without the fuss.
Prep Time25 minutes
Bake Time18 minutes
Total Time43 minutes
Course: Dessert Recipes
Cuisine: American
Servings: 24 Servings
Calories: 477kcal
Author: Laura

Ingredients

Cake

  • 1 cup water
  • 1 cup butter
  • 3 tbsp unsweetened cocoa powder
  • 2 cups all-purpose flour
  • 2 cups granulated sugar
  • 1 tsp baking soda
  • 1/2 tsp salt
  • 1/2 cup sour cream
  • 2 large eggs slightly beaten
  • 1 tsp vanilla extract

Frosting

  • 3/4 cup milk
  • 6 tbsp unsweetened cocoa powder
  • 1 cup butter
  • 7 1/2 cups powdered sugar

Topping

  • 10 ounces mini marshmallows
  • 1 cup chopped pecans

Instructions

  • Preheat the oven to 350°F
  • Spray an 18x13 inch jelly roll pan with non-stick cooking spray and set aside
  • In a large mixing bowl, whisk together flour, sugar, baking soda, and salt
    A metal mixing bowl containing white flour and granulated sugar being whisked together with a wire whisk.
  • In a small bowl, whisk together sour cream, eggs, and vanilla extract
    A metal whisk in a white bowl with two raw eggs, a dollop of sour cream, and some liquid ingredients.
  • Add the wet mixture to the dry ingredients and mix just until combined
    A metal whisk is in a pot of bubbling chocolate pudding being stirred.
  • In a medium saucepan, combine water, butter, and cocoa powder
  • Bring the mixture to a boil over medium-high heat
    A whisk stirs a pot of chocolate mixture on a stove, showing swirls in the liquid.
  • Pour the hot cocoa mixture into the batter and whisk until smooth
  • Pour the batter into the prepared pan and spread it out evenly
    Chocolate cake batter being poured into a baking pan.
  • Bake for 15 to 18 minutes or until a toothpick inserted in the center comes out clean
    A baking sheet filled with raw chocolate cake batter, ready to be baked.
  • While the cake is baking, prepare the frosting
  • In a medium saucepan, combine milk, cocoa powder, and butter
    Two sticks of butter, cocoa powder, and liquid cream in a saucepan, ready to be mixed and heated.
  • Bring to a boil over medium-high heat
  • In a large bowl, combine the powdered sugar and the hot cocoa mixture
    A saucepan containing a chocolate mixture and dry flour being mixed with a whisk on a white countertop.
  • Whisk until smooth
  • Use a hand mixer if needed to remove any lumps
  • Pour half of the hot frosting over the hot cake and spread evenly
    A stream of melted chocolate is being poured from a bowl onto a flat surface, creating a smooth, glossy pool.
  • Sprinkle the mini marshmallows and chopped pecans on top
    A baking sheet covered with mini marshmallows and pecan halves arranged in a single layer.
  • Drizzle the remaining frosting over the marshmallows and pecans
    A close-up of a tray filled with chocolate-drizzled marshmallows and pecans, likely freshly made rocky road dessert.
  • Let the cake cool to room temperature before slicing and serving
    A square piece of chocolate cake topped with marshmallows, pecans, and chocolate drizzle on a white plate, with more cake in the background.

Video

Notes

Pecans are traditional, but you can use peanuts or walnuts instead.

Nutrition

Serving: 1 Serving | Calories: 477kcal | Carbohydrates: 74g | Protein: 3g | Fat: 21g | Saturated Fat: 11g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 6g | Trans Fat: 1g | Cholesterol: 60mg | Sodium: 237mg | Potassium: 88mg | Fiber: 1g | Sugar: 61g | Vitamin A: 540IU | Vitamin C: 0.1mg | Calcium: 29mg | Iron: 1mg