Mix flour, baking powder, soda, and salt. Set aside.
Step 1
INSTRUCTIONS
Beat butter, cream cheese, and sugar until frothy with a medium-speed electric mixer. Add egg and vanilla, stir thoroughly.
Step 2
Lower mixer speed. Gradually add the flour mixture and mix until incorporated or a few flour streaks remain.
Step 3
Mix in 1/3 cup sprinkles. Cover and chill dough overnight or for 1 hour. Heat the oven to 350°F. Cover baking sheets with parchment or silicone.
Step 4
Roll cookies into balls with 2 teaspoons of dough.* Place cookies on prepared pans, leaving 3 inches between them. Flatten each top slightly. Add extra sprinkles.
Step 5
Bake 12–15 minutes until sides are gently browned and centers are firm. Cool pans on wire racks for 5 minutes. Transfer the cookies to a wire rack to finish cooling.