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Home » Recipes » Desserts

Marshmallow Brownies

Published: May 22, 2025 by Janet · This post may contain affiliate links · Leave a Comment

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Why You’ll Love This Recipe

This dessert is a crowd-pleaser that combines the rich flavor of brownies with the sweet, gooey texture of marshmallows and the creamy finish of chocolate frosting. It's easy to make, especially with the convenience of a boxed brownie mix, and offers a nostalgic taste reminiscent of Mississippi mud brownies. Whether you're baking for a family gathering or a special occasion, these brownies are sure to impress.

Ingredients

  • 1 (18-ounce) box brownie mix, plus ingredients specified on the box

  • 2 cups mini marshmallows

  • ½ cup unsalted butter

  • 2 cups powdered sugar

  • ¼ cup unsweetened cocoa powder

  • 2 tablespoons milk

  • 1 teaspoon vanilla extract

(Tip: You'll find the full list of ingredients and measurements in the recipe card below.)

Directions

  1. Prepare the Brownie Base: Preheat your oven according to the instructions on the brownie mix box. Prepare the brownie batter as directed on the box.

  2. Bake the Brownies: Pour the prepared brownie batter into a greased 9×9-inch baking pan. Bake for 30 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.

  3. Add Marshmallows: Remove the brownies from the oven and evenly sprinkle the mini marshmallows over the top. Return the pan to the oven and bake for an additional 3 minutes, or until the marshmallows have puffed up.

  4. Prepare the Frosting: While the marshmallows are baking, prepare the chocolate frosting. In a medium bowl, beat together the butter, powdered sugar, cocoa powder, milk, and vanilla extract until smooth and creamy.

  5. Frost the Brownies: Once the marshmallows have puffed up, remove the brownies from the oven and let them cool for about 10 minutes. Spread the prepared chocolate frosting over the marshmallow layer.

  6. Cool and Serve: Allow the brownies to cool completely before slicing into squares. For cleaner cuts, use a plastic knife.

Servings and Timing

  • Servings: Approximately 20 brownies

  • Prep Time: 15 minutes

  • Cook Time: 30 minutes

  • Additional Baking Time: 3 minutes

  • Total Time: Approximately 45 minutes

Variations

  • S'mores Brownies: Add a layer of graham cracker crumbs between the brownie base and marshmallows for a s'mores-inspired twist.

  • Nutty Brownies: Incorporate chopped nuts, such as walnuts or pecans, into the brownie batter for added texture.

  • Peanut Butter Swirl: Swirl in some peanut butter into the brownie batter before baking for a rich, nutty flavor.

  • Mint Chocolate: Add a few drops of mint extract to the frosting for a refreshing mint chocolate flavor.

Storage/Reheating

  • Storage: Store the brownies in an airtight container at room temperature for up to 5 days.

  • Reheating: To enjoy them warm, microwave individual servings for 10-15 seconds.

FAQs

Can I use homemade brownie batter instead of a box mix?

Yes, you can use your favorite homemade brownie recipe. Just ensure the batter is thick and fudgy to support the marshmallow layer.

What if I don't have mini marshmallows?

You can use regular-sized marshmallows, but cut them into smaller pieces to ensure even distribution.

Can I make these brownies ahead of time?

Absolutely! Prepare and bake the brownies, then store them in an airtight container. Frost them just before serving for the best texture.

How do I prevent the marshmallows from burning?

Keep a close eye on the brownies during the final 3 minutes of baking. Remove them as soon as the marshmallows are puffed and slightly golden.

Can I freeze these brownies?

Yes, you can freeze the brownies before frosting. Wrap them tightly in plastic wrap and aluminum foil, and store in the freezer for up to 2 months. Thaw before frosting and serving.

Is there a substitute for the chocolate frosting?

You can use store-bought chocolate frosting or a simple ganache made from melted chocolate and cream.

How do I get clean cuts when slicing?

Use a plastic knife to slice the brownies. Clean the knife between cuts to prevent sticking.

Can I add other toppings?

Yes, consider adding chocolate chips, crushed graham crackers, or a drizzle of caramel sauce for extra flavor.

Are these brownies suitable for gluten-free diets?

If you use a gluten-free brownie mix and ensure all other ingredients are gluten-free, these brownies can be made gluten-free.

Can I use a different size pan?

Using a 9×13-inch pan will yield thinner brownies. Adjust the baking time accordingly, checking for doneness with a toothpick.

Conclusion

These Marshmallow Brownies offer a delightful combination of textures and flavors, from the fudgy base to the gooey marshmallow center and the rich chocolate frosting. They're easy to make, customizable, and perfect for sharing with friends and family. Whether you're a seasoned baker or a beginner, this recipe is sure to become a favorite in your dessert repertoire.

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Marshmallow Brownies

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These Marshmallow Brownies are a delightful twist on the classic dessert, offering a rich, fudgy base topped with gooey marshmallows and finished with a luscious chocolate frosting. Perfect for any occasion, combining the best elements of brownies and s'mores into one irresistible treat.

  • Author: Janet
  • Prep Time: 15 minutes
  • Cook Time: 33 minutes
  • Total Time: 48 minutes
  • Yield: Approximately 20 brownies
  • Category: Dessert
  • Method: Baking
  • Cuisine: American
  • Diet: Vegetarian

Ingredients

1 (18-ounce) box brownie mix, plus ingredients specified on the box

2 cups mini marshmallows

½ cup unsalted butter

2 cups powdered sugar

¼ cup unsweetened cocoa powder

2 tablespoons milk

1 teaspoon vanilla extract

Instructions

  1. Preheat your oven according to the instructions on the brownie mix box. Prepare the brownie batter as directed on the box.
  2. Pour the prepared brownie batter into a greased 9×9-inch baking pan. Bake for 30 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
  3. Remove the brownies from the oven and evenly sprinkle the mini marshmallows over the top. Return the pan to the oven and bake for an additional 3 minutes, or until the marshmallows have puffed up.
  4. While the marshmallows are baking, prepare the chocolate frosting by beating together the butter, powdered sugar, cocoa powder, milk, and vanilla extract until smooth and creamy.
  5. Once the marshmallows have puffed up, remove the brownies from the oven and let them cool for about 10 minutes. Spread the prepared chocolate frosting over the marshmallow layer.
  6. Allow the brownies to cool completely before slicing into squares. For cleaner cuts, use a plastic knife.

Notes

  • For a s'mores twist, add a layer of graham cracker crumbs between the brownie base and marshmallows.
  • Incorporate chopped nuts like walnuts or pecans into the batter for added texture.
  • Swirl peanut butter into the brownie batter before baking for a nutty flavor.
  • Add a few drops of mint extract to the frosting for a mint chocolate variation.
  • Store brownies in an airtight container at room temperature for up to 5 days.
  • Microwave individual servings for 10-15 seconds to reheat.
  • Use a plastic knife and clean it between cuts for clean slicing.
  • Can substitute store-bought chocolate frosting or ganache if desired.
  • Use gluten-free brownie mix and ingredients for a gluten-free version.
  • Adjust baking time if using a different pan size.

Nutrition

  • Serving Size: 1 brownie
  • Calories: Approx. 210
  • Sugar: 25g
  • Sodium: 150mg
  • Fat: 9g
  • Saturated Fat: 5g
  • Unsaturated Fat: 3g
  • Trans Fat: 0g
  • Carbohydrates: 33g
  • Fiber: 1g
  • Protein: 2g
  • Cholesterol: 20mg

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Hi, I’m Janet! Welcome to Recipes by Janet, where I share simple, delicious, and reliable recipes for every meal.

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