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Chewy Funfetti Sugar Cookie Bars: Easy Birthday Party Treats

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These chewy funfetti sugar cookie bars are a festive, crowd-pleasing treat perfect for birthdays, potlucks, or any celebration. Soft, buttery, and loaded with colorful sprinkles, they come together quickly in one bowl and can be frosted for extra indulgence.

Ingredients

Scale
  • 2 1/4 cups all-purpose flour
  • 2 teaspoons cornstarch
  • 1/2 teaspoon baking powder
  • 1/4 teaspoon baking soda
  • 1/2 teaspoon fine salt
  • 3/4 cup unsalted butter, softened
  • 1 cup granulated sugar
  • 1 large egg, room temperature
  • 1 large egg yolk, room temperature
  • 2 teaspoons pure vanilla extract
  • 1/2 teaspoon almond extract (optional)
  • 1/2 cup rainbow sprinkles (jimmies, not nonpareils)
  • For the Frosting (optional):
  • 1/2 cup unsalted butter, softened
  • 2 cups powdered sugar
  • 1–2 tablespoons milk or cream
  • 1 teaspoon pure vanilla extract
  • Pinch of salt
  • 1/4 cup extra rainbow sprinkles (for topping)

Instructions

  1. Preheat oven to 350°F (175°C). Line a 9×13-inch pan with parchment paper, leaving an overhang.
  2. In a medium bowl, whisk together flour, cornstarch, baking powder, baking soda, and salt. Set aside.
  3. In a large mixing bowl, beat softened butter and granulated sugar on medium-high until light and fluffy, about 2-3 minutes.
  4. Beat in egg and egg yolk, one at a time, until well incorporated. Mix in vanilla extract and almond extract (if using). Scrape down sides as needed.
  5. Gradually add the dry ingredients to the wet mixture, mixing on low just until combined. Do not overmix.
  6. Gently fold in rainbow sprinkles with a rubber spatula.
  7. Transfer dough to prepared pan and press into an even layer.
  8. Bake for 22-26 minutes, until bars are set and lightly golden at the edges. The center should look slightly underdone.
  9. Let pan cool completely on a wire rack before slicing.
  10. For frosting (optional): Beat softened butter until creamy. Add powdered sugar, vanilla, and salt. Mix in milk or cream until smooth and spreadable.
  11. Spread frosting over cooled bars and top with extra sprinkles.
  12. Lift bars out using parchment paper overhang, cut into squares or rectangles, and serve.

Notes

Use room temperature ingredients for best texture. Do not overmix after adding flour. Classic jimmies sprinkles work best; nonpareils may bleed color. For gluten-free, use a 1-to-1 blend. Bars can be frosted or served plain. Store in airtight container at room temp for 3 days or refrigerate for up to a week. Freeze for up to 2 months.

Nutrition

Keywords: funfetti, sugar cookie bars, birthday dessert, chewy cookie bars, party treats, easy baking, sprinkles, kid-friendly, potluck dessert, celebration

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