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Party Brownies Recipe

4.9 from 84 reviews

Delight in these colorful Party Brownies featuring a rich homemade chocolate frosting topped with vibrant rainbow sprinkles. This fun and festive treat combines the ease of a classic boxed brownie mix with a luscious boiled chocolate frosting that sets to perfection, making it ideal for celebrations and gatherings.

Ingredients

Scale

Brownies

  • 1 box brownie mix (1618 ounces)
  • 6 tablespoons butter
  • 1/3 cup milk

Frosting

  • 1 1/4 cups granulated sugar
  • 1 teaspoon vanilla extract
  • 1/2 teaspoon coarse kosher salt
  • 1 cup semi-sweet chocolate chips
  • Rainbow sprinkles

Instructions

  1. Make the brownies: Prepare the brownie batter following the package directions carefully. Pour the batter into a 9×13 inch or slightly smaller rectangular baking pan, ensuring even distribution.
  2. Bake the brownies: Bake according to the brownie mix package instructions, typically at 350°F for 25-35 minutes. Allow the baked brownies to cool for about an hour to ensure they are set before frosting.
  3. Make the frosting: In a small saucepan over medium heat, melt the 6 tablespoons of butter. Add milk, granulated sugar, vanilla extract, and coarse kosher salt. Bring this mixture to a consistent rolling boil and maintain the boil for 45 seconds exactly, using a timer to prevent overcooking.
  4. Mix in the chocolate: Remove the saucepan from heat and immediately add the semi-sweet chocolate chips. Stir continuously until the chocolate is fully melted and the frosting is smooth. Whisk vigorously if lumps remain.
  5. Frost the brownies: Quickly pour the warm frosting over the cooled brownies. Spread evenly with a spatula since the frosting sets rapidly. Immediately sprinkle rainbow sprinkles on top to decorate before the frosting hardens.
  6. Rest and serve: Let the frosted brownies rest at room temperature for 15 to 30 minutes to allow the frosting to set completely. Use a sharp knife to cut clean slices, then serve and enjoy the festive treat!

Notes

  • Use a 9×13 inch pan or slightly smaller rectangular pan to achieve the right thickness for frosting.
  • Work quickly when spreading frosting because it starts to set immediately once poured.
  • For cleaner slices, allow the frosting to rest longer before cutting.

Keywords: party brownies, chocolate brownies, homemade frosting, festive dessert, rainbow sprinkles