Preheat the oven to 400º F
In a large bowl, add the dry ingredients and whisk to blend.
Add the cold butter and use a pastry blender to cut the butter into the flour. When you are done it will look like there are pebbles in the flour.
Pour the milk into the bowl and mix into a dough ball.
Place a piece of wax paper down and put the dough ball on it. Feel free to dust the dough with a little gluten free flour.
Press the dough to 1 ½ to 2 inches thick. Use a biscuit cutter to cut out biscuit shapes. Do not twist the biscuit cutter when pulling it out of the dough.
Place the biscuits onto a parchment paper lined baking sheet.
Brush the top of each biscuit with milk. This will help the tops get golden.
Bake for 20 minutes or until the tops are slightly golden. Actual time may vary depending on the size of your biscuits.