Spray the cookie sheet with cooking spray. Increase milk to 1 cup. Drop dough by 12 spoonfuls, about 2 inches apart, onto the cookie sheet.
To cut biscuits, push a round cutter dipped in flour straight down in the dough. Remove excess dough around biscuits. Using a turner, move each biscuit to a cookie sheet.
To cut remaining biscuits, gather the excess dough together and gently flatten dough until 1/2 inch thick. Use as little additional four on the surface as possible to prevent tough dry biscuits.