Cream Butter & Sugars. In the bowl of a stand mixer (or a large mixing bowl), combine softened butter, brown sugar, and sugar. Cream on medium speed with a paddle attachment or hand mixer for 2-3 minutes, until light and fluffy.
Finish Wet Ingredients. Mix in the molasses. Add egg and vanilla and mix on low speed until smooth (30-60 seconds).
Add Dry Ingredients. Next, add gluten-free flour blend, baking soda, ginger, cinnamon, cloves, and salt. Mix on low speed until just combined. Scrape down the sides of the bowl one more time and cover the cookie dough.
Chill Dough At Least 2 Hours in the fridge, up to overnight. (Make sure the dough is covered well if chilling longer than 2 hours so the dough doesn't dry out. Honestly, the longer you chill them, the better, up to 2 days.
Preheat Oven & Prep Pans. When you're ready to bake, preheat the oven to 350 degrees F. Line two baking sheets with parchment paper.
Scoop & Roll. Place coarse sugar in a small bowl. Use a medium cookie scoop to form 2-Tablespoon sized balls of dough. Roll each ball smooth in your hand, then roll in the sugar to coat well. Place 6 cookie dough balls on one of the baking sheets and return the rest of the dough to the fridge in between batches.
Bake Cookies. Bake each batch of cookies 9-11 minutes in the oven, or until edge are set and the centers look just slightly underdone. (The cookies will continue to set as they cool.) Remove the cookies from the oven and gently coax into perfect circles with a large cookie cutter, if desired.
Cool. Let the cookies cool 1-2 minutes on the baking sheet before transferring to a wire rack to cool completely.
Repeat this process until all cookies are baked, alternating baking sheets with each batch so you don't put cold cookie dough on a hot cookie sheet.
Serve & Store. Enjoy molasses cookies right away or store leftover cookies in an airtight container at room temperature 2-3 days. Or, transfer cooled baked cookies to a freezer bag and freeze up to 2 months.