Preheat oven to 350°F. Line 2 baking sheets with parchment paper, or use silicone baking mats.

In the bowl of your mixer, cream together butter, cream cheese, and vanilla until smooth (approximately 2 minutes).

Add in the powdered sugar and continue mixing.

In a separate bowl, combine flour, cornstarch, and salt. Slowly add to the butter mixture until smooth and the batter pulls away from the sides of the mixer.

Drop rounded spoonfuls onto prepared baking sheets. Gently flatten cookies with the bottom of a glass that has been dipped into powdered sugar (to prevent sticking).

Bake for 10-12 minutes. Allow to cool and set for a few minutes until the cookies are firm enough to move to a wire rack to cool completely.

Beat the cream cheese, butter, and vanilla until smooth and light in color.

Slowly add the powdered sugar and continue mixing until smooth and fluffy.

Add a drop of food coloring if desired.

When cookies are completely cool, frost cookies and add sprinkles if desired.