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Rainbow Sprinkle Sugar Cookie Bars | Easy Back-to-School Treat

rainbow sprinkle sugar cookie bars - featured image

Soft, buttery sugar cookie bars topped with creamy vanilla buttercream and rainbow sprinkles. Perfect for back-to-school treats, bake sales, or any day that needs a little extra color.

Ingredients

Scale
  • 1 cup (2 sticks) unsalted butter, melted and slightly cooled
  • 1 ½ cups granulated sugar
  • 2 large eggs, at room temperature
  • 2 teaspoons vanilla extract
  • 2 ½ cups all-purpose flour
  • 1 teaspoon baking powder
  • ½ teaspoon salt
  • ½ cup rainbow jimmies sprinkles
  • ½ cup (1 stick) unsalted butter, softened to room temperature
  • 2 ounces cream cheese, softened
  • 3 cups powdered sugar
  • 2 tablespoons heavy cream or whole milk
  • 1 teaspoon vanilla extract
  • Pinch of salt
  • Additional rainbow sprinkles for topping (about 2-3 tablespoons)

Instructions

  1. Preheat oven to 350°F (175°C). Line a 9×13-inch baking pan with parchment paper, leaving overhang on the long sides.
  2. In a medium bowl, whisk together flour, baking powder, and salt.
  3. In a large bowl, whisk melted butter and sugar until combined. Add eggs and vanilla, whisk until smooth and glossy.
  4. Pour dry ingredients into wet ingredients. Stir with a rubber spatula until just combined. Fold in ½ cup rainbow jimmies.
  5. Press dough evenly into prepared pan. Dough layer should be about ¼ to ½ inch thick.
  6. Bake for 18 to 22 minutes, until edges are lightly golden and center is set. Cool in pan on wire rack for 20 minutes, then lift out and cool completely (about 1 to 1.5 hours).
  7. For frosting: Beat softened butter and cream cheese until smooth. Add vanilla and salt. Gradually beat in powdered sugar, then add cream and beat until fluffy.
  8. Spread frosting over cooled bars. Immediately sprinkle with additional rainbow jimmies, pressing gently.
  9. Refrigerate 20-30 minutes to firm frosting. Cut into squares and serve at room temperature.

Notes

Use rainbow jimmies (long sprinkles) not nonpareils to prevent color bleeding. Do not overmix dough. Cool bars completely before frosting. For clean cuts, refrigerate frosted bars 20-30 minutes before cutting. Bars taste even better the next day.

Nutrition

Keywords: sugar cookie bars, rainbow sprinkles, back-to-school treats, easy dessert, cookie bars, buttercream frosting