In a stand mixer, beat butter and sugar together on medium-high speed until light and fluffy with the paddle attachment for about 2 minutes.
Whisk together the flour and salt and set aside.
Add the vanilla extract to the bowl, followed by about a third of the flour mixture, and mix on medium-low until all the flour is incorporated and the cookie dough is formed.
Divide the dough into 4 balls.
Knead gel color into each ball.
Using a cookie scoop add a bit of each of the 4 colors of dough into the scoop and carefully form the dough into 1" balls by gently rolling them together with your hands.
Roll cookie balls in sugar and then place the cookie balls about 2 inches apart on a baking sheet. Use a glass to press the cookies down into a disc shape.
Add sprinkles to the top of the cookie discs.
Bake for 10 minutes, or until the edges begin to lightly brown.
Transfer to a wire rack to cool and enjoy!
Notes
Storage:
To Store: These cookies will stay fresh for about 3 days in an airtight container.
To Freeze: You can freeze the cookies after they have cooled completely. Store them in an airtight container or freezer bag for up to 3 months. Thaw the cookies at room temperature before serving.
Tips:
Make sure not to over-handle your cookie dough or mix the colors together too much. Gently roll the balls in the palms of your hands and then press the balls down gently with a glass.
Try not to overmix or overbake these cookies. They should be lightly golden on the edges and soft inside.
If you like sweeter cookies you can dip them in cookie glaze and then add sprinkles to the top.
For a final magical touch brush some glitter dust over the cookies after they have cooled!