Introduction

These Party Brownies are a fun and indulgent treat perfect for any celebration. Rich and fudgy, topped with a luscious chocolate frosting and colorful sprinkles, they promise a delicious party on your taste buds.

Ingredients

1 box brownie mix (usually 16-18 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

Instructions

Step 1: Bake the brownies according to the package directions in a 9×13-inch pan or a slightly smaller rectangular pan. Once baked, allow them to cool for about an hour before frosting.
Step 2: Make the frosting by melting the butter in a small saucepan over medium heat. Add the milk, sugar, vanilla, and salt, then bring to a rolling boil over medium heat. Let it boil consistently for 45 seconds, using a timer to avoid overcooking.
Step 3: Remove the pan from heat and stir in the chocolate chips until smooth. If there are any lumps, whisk for a minute until fully combined.
Step 4: Pour the warm frosting evenly over the cooled brownies, working quickly as the frosting will begin to set immediately. Then sprinkle generously with rainbow sprinkles.
Step 5: Allow the frosting to rest for 15-30 minutes to set before cutting into slices. Serve and enjoy your party-ready brownies!

Tips & Variations

Use a timer when boiling the frosting mixture to ensure the right consistency without burning.
For a nutty twist, add chopped walnuts or pecans to the brownie batter before baking.
Substitute semi-sweet chocolate chips with dark or milk chocolate depending on your taste preference.
Try different types of sprinkles or crushed candy for varied festive looks.

Storage

Store the brownies in an airtight container at room temperature for up to 3 days. For longer storage, keep them covered in the refrigerator for up to a week. To serve, bring them back to room temperature or warm slightly for a soft, gooey texture.

How to Serve

Serve this delicious recipe with your favorite sides.

FAQs

Can I make the frosting ahead of time?

It’s best to frost the brownies soon after the frosting is made for the best texture. The frosting sets quickly once poured and tastes freshest when freshly prepared.

What if I don’t have coarse kosher salt?

You can substitute fine sea salt or table salt, but reduce the quantity slightly to avoid an overly salty taste.

Party Brownies Recipe

Print 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.

Author: Cleo
Prep Time: 15 minutes
Cook Time: 30 minutes
Total Time: 1 hour 45 minutes
Yield: 12–16 brownies 1x
Category: Dessert
Method: Baking
Cuisine: American

Ingredients

Scale

Brownies

1 box brownie mix (usually 16–18 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

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.
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.
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.
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.
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.
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