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
Find it online: https://lolohomekitchen.com/2020-1-unicorn-bars/