Preheat oven to 350°F.
In the bowl of a stand mixer fitted with the paddle attachment, cream the butter, sugar, egg, and vanilla until fluffy.
1 cup unsalted butter, 1 cup granulated sugar, 1 large egg, 1 teaspoon pure vanilla extract
In a separate bowl, stir the flour, cocoa powder, and salt together. Slowly incorporate into the butter mixture using the mixer until fully combined and smooth.
2¼ cups Gluten Free Flour, ⅓ cup unsweetened cocoa powder, ½ teaspoon kosher salt
Load dough into your Cookie Press. Operate cookie press according to package instructions, pressing cookies onto a large ungreased cookie sheet. (The cookies won't come out of the press cleanly if your sheet is greased.) Sprinkle with sprinkles of your choice if desired.
White pearl sprinkles
Bake for 5-7 minutes, or until set. Carefully place on wire rack to cool completely.