Rocky Road Brownies (Loaded with Marshmallows & Nuts!)

ByElle Rivers

Fudgy chocolate brownies loaded with gooey marshmallows, crunchy walnuts, and chocolate chips create an irresistible triple-texture treat. One bowl and zero fancy techniques make this nostalgic dessert foolproof—ready in 45 minutes.

Why This Recipe Works

  • Dense fudgy base supports heavy toppings
  • Marshmallows toast perfectly on top
  • No mixer or special skills required
  • Feeds a crowd easily
Rocky Road Brownies
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Rocky Road Brownies

Course: DessertDifficulty: Easy
Servings

16

brownies
Prep Time

15

minutes
Cook Time

30

minutes
Total Time

45

minutes

Ingredients

  • For the Brownie Base:

  • 3/4 cup unsalted butter, melted

  • 1 1/2 cups granulated sugar

  • 3 large eggs

  • 2 teaspoons vanilla extract

  • 3/4 cup unsweetened cocoa powder

  • 1 cup all-purpose flour

  • 1/2 teaspoon salt

  • 1/4 teaspoon baking powder

  • For the Rocky Road Topping:

  • 1 1/2 cups mini marshmallows

  • 1 cup semi-sweet chocolate chips

  • 3/4 cup walnuts, roughly chopped

  • 1/2 cup additional mini marshmallows for final layer

Directions

  • Preheat your oven to 350°F (175°C) and line a 9×13-inch baking pan with parchment paper, leaving overhang on the sides for easy lifting.
  • Whisk together melted butter and sugar in a large bowl until smooth. Add eggs one at a time, whisking after each addition, then stir in vanilla extract.
  • Sift cocoa powder, flour, salt, and baking powder directly into the wet ingredients. Fold gently with a spatula until just combined—batter will be thick and fudgy.
    💡 Tip: Don’t overmix or your brownies will turn cakey instead of fudgy.
  • Spread brownie batter evenly into prepared pan using an offset spatula or the back of a spoon.
  • Bake for 20 minutes until edges just start to pull away from the pan but center still looks slightly underdone.
  • Remove pan from oven and immediately sprinkle 1 1/2 cups mini marshmallows, chocolate chips, and walnuts evenly over the surface. Return to oven for 8 minutes.
    💡 Tip: Work quickly so the brownies stay hot and help melt the toppings.
  • Pull brownies out again and scatter the remaining 1/2 cup marshmallows on top. Bake for final 2 minutes until marshmallows are golden and puffed.
  • Let brownies cool completely in the pan on a wire rack for at least 1 hour before cutting—this allows the marshmallows to set and makes cutting cleaner.
  • Use the parchment overhang to lift the entire brownie slab onto a cutting board. Cut into 16 squares with a sharp knife, wiping the blade between cuts.

🎯 Pro Tips & Substitutions

Bake brownies completely but wait to add the final marshmallow layer. Store the base brownies covered at room temperature for up to 2 days. When ready to serve, add the last 1/2 cup marshmallows and broil for 1-2 minutes watching carefully until golden. This keeps marshmallows fresh and fluffy rather than stale.

Use high-quality unsweetened cocoa powder like Hershey’s Special Dark or Ghirardelli for the deepest chocolate flavor. For chocolate chips, semi-sweet works perfectly, but dark chocolate chips create a more sophisticated taste. Avoid milk chocolate chips as they’re too sweet and can make the brownies cloying with all the marshmallows.

Marshmallows burn quickly when exposed to direct heat too long. Make sure your oven temperature is accurate—use an oven thermometer if needed. The first layer of marshmallows is protected by being added at 20 minutes with 10 minutes remaining. Only the final layer toasts, and it needs just 2 minutes. If your oven runs hot, reduce temperature to 325°F.

You can use an 8×8-inch pan for thicker brownies, but increase baking time to 28 minutes before adding first topping layer, then 10 minutes more. For a 9×9-inch pan, reduce initial baking to 18 minutes. Avoid going larger than 9×13 or brownies will be too thin and dry out.

Store brownies in an airtight container at room temperature for up to 4 days. Layer parchment paper between stacked brownies to prevent sticking. Don’t refrigerate—cold temperatures make brownies hard and marshmallows rubbery. For longer storage, freeze individual brownies wrapped in plastic wrap then foil for up to 3 months. Thaw at room temperature for 2 hours before serving.

❓ Frequently Asked Questions

Absolutely—simply omit the walnuts and add an extra 1/2 cup of chocolate chips or mini marshmallows to maintain the loaded topping effect. You can also substitute with sunflower seeds for crunch if allergies aren’t a concern, or add crushed graham crackers for that classic rocky road campfire vibe.

Mini marshmallows work best because they distribute evenly and melt at the perfect rate. Regular large marshmallows can be used but cut them into quarters with kitchen scissors first. They won’t spread as nicely and may create uneven pockets, but the flavor will still be delicious.

Serve these brownies slightly warm with a scoop of vanilla ice cream for the ultimate dessert experience. The cold ice cream contrasts beautifully with the warm, gooey marshmallows. They’re also perfect alongside hot coffee or cold milk. For parties, cut them into smaller 1-inch squares for bite-sized treats that go twice as far.

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