2Spray an 8" square baking dish with nonstick cooking spray. Melt stick of butter in dish. (either in microwave or in oven).
3In medium bowl, mix together the flour, sugar, baking powder, and salt. Pour in the buttermilk. Stir until a loose dough forms. Batter will be a bit sticky.
4Press biscuit dough into baking dish, right on top of the melted butter. It is easiest to spread it out with your hands. (it is okay if some of the butter runs over the top of the dough) Take a sharp knife and cut the biscuit dough into nine squares before baking.
5Bake for about 20-25 minutes or until golden brown and springs back to the touch. Note: If you notice that some of the butter is coming up to the top during baking, and getting too brown, just take a paper towel and dab around the edges a bit.