Preheat your oven to 425 degrees. Grease an 8-inch cast-iron pan or 9-inch round cake pan. Place the cast-iron pan in the oven so it heats up while you mix all of the ingredients. I combined all of the dry ingredients in a medium-sized bowl to distribute them evenly. Then I added the melted butter, the egg, buttermilk, and the sour cream. Then you mix thoroughly, but do not overmix. Remove the cast-iron pan from the oven. Spread the batter evenly in the pan and bake for 20-25 minutes until golden brown. Serve warm with butter or honey butter.