Unicorn Bars

Prep time:   |  Cook time: 25 mins  |  Total: 25 minutes



1/2 cup (1 stick) butter, room temperature

3/4 cup sugar

1 large egg + 1 egg yolk

2 teaspoons pure vanilla extract

1 and 1/2 cups all-purpose flour

1/4 teaspoon salt

1 teaspoon baking powder

1/2 teaspoon baking soda

1 and 1/2 teaspoons cornstarch

1/2 cup rainbow sprinkles


  1. Preheat oven to 350 degrees. Line an 8-inch square baking pan with parchment paper or spray with nonstick spray. Set aside.
  2. In a stand mixer, beat the butter for about 1 minute on medium speed. Add the sugar on medium speed until light and fluffy. Beat in egg, egg yolk, and vanilla. Scrape down the sides as needed.
  3. In a separate bowl, whisk together the flour, salt, baking powder, baking soda, and cornstarch. Add the dry ingredients to the wet ingredients in 3 parts with the mixer on low. Once combined, add 1/2 cup sprinkles with the mixer on low.
  4. Press the cookie dough evenly into the baking pan. Bake for 25-26 minutes or until very lightly browned on top. You want the cookie bars to be extra soft, so careful not to overbake. Allow the bars to cool completely on a wire rack at room temperature before frosting. The center will slightly sink – that’s normal.