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Mom's Rocky Road Cookie Bars

Mom’s Rocky Road Cookie Bars

Mom's rocky road cookie bars are made of a chewy and moist brownie base and a fluffy and gooey marshmallow topping. An easy one-pan dessert for the whole family.
Course Dessert
Cuisine American
Keyword classic recipe, easy dessert recipe, kid-friendly recipes
Prep Time 10 minutes
Cook Time 25 minutes
Total Time 35 minutes
Servings 36 cookie bars
Calories 163kcal


For the cookie bars:

  • 2 cups granulated sugar
  • 1 cup butter softened
  • 1/3 cup cocoa powder
  • 1 teaspoon vanilla extract
  • 4 large eggs
  • 1 1/2 cups flour
  • 1/4 teaspoon salt
  • 1 1/2 bags marshmallows

For the frosting:


  • Preheat oven to 350°F. In a stand mixer, mix together the butter, sugar, cocoa powder and vanilla on medium speed. Next, add in one egg at a time and fully incorporate it before adding the next. Mix in the flour and salt last, until the batter is creamy and smooth. Pour the the batter into a greased 1-inch baking sheet and bake on 350°F for 20 minutes.
  • While the cookie bar base is baking, cut the marshmallows in half and set aside.
  • In a small mixing bowl, whisk together the butter, cocoa, evaporated milk, vanilla, powdered sugar, and salt for the frosting. Mix until it is smooth and creamy.
  • Remove the cookie sheet from the oven and place the marshmallow halves in rows on top. There should be 10 marshmallow halves per row, and about 20 rows total. Put the cookie bars back in the oven for 5-6 minutes to let the marshmallows puff.
  • Remove the cookie bars from the oven and generously drizzle the frosting over the marshmallows. Place the cookie sheet in the refrigerator for at least 30 minutes to set. Serve chilled in 2 to 4 square servings, and store the leftovers in the refrigerator. Enjoy!
  • Feel free to sprinkle crushed walnuts on top for a traditional rocky road cookie.


Serving: 4bars | Calories: 163kcal | Carbohydrates: 21g | Protein: 1g | Fat: 8g | Saturated Fat: 5g | Cholesterol: 41mg | Sodium: 110mg | Potassium: 41mg | Sugar: 16g | Vitamin A: 270IU | Calcium: 13mg | Iron: 0.5mg