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Party Brownies Recipe

4.7 from 585 reviews

These Party Brownies are a delightful twist on classic brownies with a rich, homemade chocolate frosting and fun rainbow sprinkles to elevate any celebration. Made from a simple brownie mix base and topped with a glossy, decadent chocolate frosting that sets quickly, these brownies are perfect for parties, gatherings, or whenever you crave a sweet treat.

Ingredients

Scale

Brownies

  • 1 box brownie mix (usually 1618 ounces)
  • 6 tablespoons butter
  • 1/3 cup milk
  • 1 1/4 cups granulated sugar
  • 1 teaspoon vanilla extract
  • 1/2 teaspoon coarse kosher salt
  • 1 cup semi-sweet chocolate chips
  • Rainbow sprinkles, for topping

Instructions

  1. Make the brownies: Preheat your oven according to the brownie mix package instructions. Prepare the brownie batter as directed and pour it into a greased 9×13-inch or slightly smaller rectangular baking pan.
  2. Bake the brownies: Bake according to the package directions, making sure the brownies cook evenly. After baking, let them cool for about an hour before frosting to ensure the frosting adheres properly.
  3. Make the frosting: In a small saucepan over medium heat, melt the butter. Once melted, add the milk, granulated sugar, vanilla extract, and coarse kosher salt. Bring the mixture to a consistent, rolling boil and maintain it for exactly 45 seconds—using a timer is crucial to avoid overcooking.
  4. Mix in the chocolate: Remove the saucepan from heat and immediately add the semi-sweet chocolate chips. Stir vigorously until fully combined and smooth; if any lumps remain, whisk for another minute until silky.
  5. Frost the brownies: Quickly pour the warm frosting evenly over the cooled brownies, spreading it out immediately with a spatula or knife. Add rainbow sprinkles on top before the frosting sets—it will begin to set almost right away, so speed is key.
  6. Rest and serve: Allow the frosting to rest and set for 15 to 30 minutes depending on how clean you want your slices to be. Once set, cut into squares, serve, and enjoy the party!

Notes

  • Use a 9×13-inch or a slightly smaller rectangular pan to bake your brownies as the frosting recipe is sized perfectly for this amount.
  • Start spreading the frosting immediately after pouring it, as it sets very fast—working quickly ensures a smooth topping.
  • The frosting can be a bit soft if eaten too soon; letting it rest gives cleaner slices and firmer texture.

Keywords: party brownies, chocolate brownies, homemade frosting, rainbow sprinkles, easy brownies, celebration dessert