In a large bowl with a hand mixer, combine the butter, cream cheese, and both sugars. Mix this suuuuuper well!
Next, add the egg and vanilla extract. If the butter and egg are not the same temperature, it is possible that the mix will curdle. Don’t panic!
Next, in a small bowl, sift together the gluten free flour, cornstarch, cocoa, baking powder, cream of tartar, and salt. Now add this flour mixture to the wet ingredients and mix.
Now, roll out the dough between two sheets of parchment paper, and roll to get a cookie about ¼ inch thick.
Bake the cookies for 10-12 minutes or until the cookie edge slightly pulls away from the paper. Decorate when cool.
No bones about it, these cookies are delicious! What instrument does a skeleton play in a marching band? The trim-BONE!
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