Ingredients:

  • 1 cup (226g) unsalted butter, softened
  • 1 cup (200g) granulated sugar
  • 1 large egg, room temperature
  • 2 teaspoons vanilla extract
  • 2.5 cups (312g) all-purpose flour
  • 2 tablespoons cornstarch
  • 1 teaspoon baking powder
  • 0.5 teaspoon salt
  • 0.5 cup rainbow jimmies (folded into dough)
  • 0.25 cup extra sprinkles (for topping)

Instructions:

  1. Preheat your oven to 350°F (175°C) and line two large baking sheets with parchment paper.
  2. In a mixer bowl, cream the softened butter and granulated sugar on medium-high speed for 3 minutes until pale and aerated. Beat in the egg and vanilla extract until smooth.
  3. Turn the mixer to low and gradually add the all-purpose flour, cornstarch, baking powder, and salt. Mix just until the white streaks disappear.
  4. Gently fold in 1/2 cup of rainbow jimmies by hand to prevent color bleeding.
  5. Roll 1.5 tablespoon balls of dough until smooth and round.
  6. Press extra sprinkles onto the tops of the cookies. Bake for 10 minutes or until the edges are set but the tops remain pale.
  7. Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire cooling rack.