Preheat the oven to 375°
Cream the butter in a stand mixer or in a bowl with a hand mixer.
Add the sugars and beat for about 4 minutes.
Add the egg and vanilla and mix well.
Add the flour, cream of tartar, baking soda, salt and nutmeg and mix on low until just incorporated.
Turn the dough out on a lightly floured surface and form into a ball.
Cut the ball in half. Refrigerate the half you are not using.
Roll the dough out to about 1/4"
Cut out cookies with cookie cutters and move them carefully to cookie sheets lined with parchment or silicone mats
Bake in the preheated oven for about 10 minutes or until the cookies are just starting to brown
Cool on a wire rack.
Repeat with the other half of the dough.