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4.34 from 9 votes

Birthday Confetti Frosted Sugar Cookie Bars

Birthday Confetti Frosted Sugar Cookie Bars are soft and thick with just the right amount of ultimate Birthday Confetti Frosting. Baked in a 9×13 pan, and you can make these bars big or small for your Bday Bash!
Prep Time20 mins
Cook Time15 mins
Course: Dessert
Cuisine: American
Keyword: birthday, confetti, cookie bars, cookies, dessert, party treat, sprinkles
Servings: 15 Servings
Author: Kim Lange


  • Sugar Cookie Bars:
  • ¾ cup butter softened to cool room temperature
  • ¾ cup granulated sugar
  • ¼ cup powdered sugar
  • 2 large eggs
  • 1 teaspoon vanilla extract or ½ teaspoon almond extract
  • 2 ¼ cups all-purpose flour or gluten free flour like Bob's Red Mill
  • 1 teaspoon baking powder
  • ½ teaspoon salt
  • Optional: ½ cup Sprinkles + additional sprinkles for top
  • 8 tablespoons butter softened
  • 3 cups powdered sugar
  • 4 tablespoons milk or cream
  • ¼ teaspoon vanilla extract or almond extract
  • Optional: food coloring gel
  • ½ cup Sprinkles + additional sprinkles for top of frosting


  • Preheat oven to 375 degrees F.
  • Lightly grease a 9X13-inch baking pan with cooking spray or line with parchment paper and grease. Set aside.
  • Sugar Cookie Bars:
  • In a large bowl, cream together the butter, granulated sugar and powdered sugar until light and fluffy. Add the eggs and vanilla and mix for 1-2 minutes. Stir in flour, baking powder and salt. Mix until combined. Optional: If you want sprinkles in cookie bars, add in ½ cup and mix in.
  • Press the sugar cookie dough into an even layer in the bottom of the prepared pan.
  • Bake for 15-18 minutes. TIP: The bars should have hardly any color around the edges and barely be set in the middle, Don't overbake! Let the bars cool completely before frosting.
  • Frosting:
  • Cream together the butter and powdered sugar until combined, add a little milk if needed if not mixing well, then add in the vanilla, milk or cream, and food coloring (if using), and mix until the frosting is light and fluffy, 1-2 minutes. Add in ½ cup sprinkles and mix into frosting, add more sprinkles if you want.
  • Spread the frosting over the cooled bars and top with more sprinkles.