Cream together the buttered rum mix, egg, and vanilla. Add the dry ingredients and mix to combine thoroughly. Chill the mixture in the refrigerator for at least 1 hour.
Preheat oven to 325°F degrees. Scoop tablespoon size portions of the mixture and roll into balls. Place on a silpat or parchment lined baking sheet. Bake 10 minutes, just until the cookies look slightly cracked across the top.
They should still be soft when they are removed from the oven. Smack the pan down hard once or twice on the countertop to help them settle. Let cool on the baking sheet for 2-3 minutes before removing to a wire cooling rack. Enjoy!
Notes
Note: The Hot Buttered Rum Mix is need as the creamy base for these cookies. Click here for that recipe.