Prepare a baking sheet by lining with parchment paper and set aside.
Preheat oven to 400F.
Whisk all dry ingredients together in a bowl and add butter/vegan butter or coconut oil in small pieces. Cut in with a pastry cutter or use the paddle attachment on a stand mixer, mixing just until the dry mix is pebbly.
Whisk egg, if using, and stir into dry ingredient bowl with milk using a fork, mixing until a dough is formed, but no longer. Particularly if using an egg sub, be sure the dough is not dry or crumbly at this stage; it should hold together well and not crack. If it's too dry, add extra milk by the tablespoon until it holds together well.
Either scoop out onto prepared baking sheet for drop biscuits or turn dough out onto a clean counter or pastry mat dusted with gfJules Flour and pat to 3/4-1 - inch thick. Cut using biscuit cutters by cutting straight down -- do not twist the cutter. Place biscuits on prepared baking sheet.
If making cheese biscuits, add 1-2 tablespoons (to your taste) of cheddar cheese shreds to each biscuit in your hands and press together to mix, then press out and cut or drop biscuits onto baking sheet.
Brush the top of each biscuit with more coconut milk or melted butter before baking.
Place the pan on an upper rack close to, but not the closest to the top of the oven. Bake for 8 minutes. If the biscuits have not browned to your liking, you can use the broil feature for the last 1-2 minutes, but monitor closely to ensure they do not burn.