Combine 210 grams (about 1 1/2 cups) flour, yeast, sugar, water, salt, xanthan gum, baking powder, and cinnamon in a large mixing bowl. Stir butter into mixture with a wooden spoon. Add remaining 140 grams (1 cup) flour to mixture. Stir flour into dough; knead with hands to fully incorporate flour, if needed. Form a ball with dough.