Preheat the oven to 450 degrees. Mix together the flour, baking powder, salt, and garlic powder in a large bowl. Cut the butter into small cubes and work the cubes into the flour mixture. Pour in the buttermilk and mix. Add cheddar cheese, then continue to mix. Spray down a baking sheet. Scoop 1/4 cup of batter, shape into a biscuit with your hands, and place onto the sheet pan. Bake for 10 minutes.