Preheat oven to 350 degrees.

Cream butter and sugar together. Beat egg in wet mixture until throughly combined, add vanilla or almond extract.

In a separate bowl, combine flour, cream of tartar, baking soda, Apple pie spice or cinnamon and salt.

Blend dry ingredients into butter mixture, 1/3 at a time.

Gently stir in rainbow sprinkles.

Chill dough in saran wrap for about 20 min.

Roll out dough by hand on chilled cookie sheet with parchment paper.

Optional: Sprinkle some sugar on top.

Bake for 10-12 minutes.