This recipe could still use a little tweaking, but I'm not sure how and it's nice enough as it is.
Preheat oven to 350 degrees.
In a large bowl (or electric mixer's bowl) combine:
Give the dry ingredients a stir with the teaspoon you are holding, to distribute the xanthan gum into the flour mix before it gets wet. Then mix everything well.
Put rows of small cookies on a greased cookie sheet (or cookie sheet with a silicon mat). On each cookie put one round chocolate mint (sometimes called "drops" or "wafers"). Your cookies should be small: just enough to make a little ring of dough around the mints as you press them down.
Bake on a for 15-17 minutes, until the bottoms are browned.
(The recipe also works as a bar cookie, if you melt the mints with some heavy cream in the microwave and drizzle that on the top.)