[Ingredients]
3 cups all-purpose flour
1 cup powdered sugar
1 cup (2 sticks) unsalted butter, cut into pieces
1/2 teaspoon salt
4 large egg yolks
1 teaspoon vanilla
Egg wash (1 egg white & 2 teaspoons of water, whisked)
Sprinkles, for decoration
[Steps]
Preheat oven to 350degF.
Place flour, sugar, butter, and salt in the bowl of a food processor; process until the texture resembles coarse crumbs.
In a small bowl, whisk together egg yolks and vanilla; add to the processor with the motor running. Process until the dough forms into a ball.
Fill piping bag with cookie dough, fitted with a star tip. Pipe onto prepared parchment-lined baking tray.
Use a pastry brush to brush the cookies with the egg wash and decorate with sprinkles as desired. Bake for 10 - 15 minutes until the cookies are firm but not brown. Cool completely on a wire rack.