In a small bowl add the flour, salt and pepper and set aside. Cut biscuits into quarters and set these aside. 

Spray casserole dish with cooking spray and place half of the quartered biscuits onto bottom of dish. Cook at 400° for 10 minutes. 

While biscuits are in oven baking you will need to make your gravy. In a medium skillet add ground beef and cook over medium/high heat until no longer pink. Reduce heat to medium. Sprinkle flour mixture on ground beef and stir until flour mixture has been absorbed into the ground beef.

Add milk to ground beef mixture and turn heat to high until it begins to bubble stirring frequently. Reduce heat to low and continue to simmer gravy until it begins to thicken. 

Once you have gravy pour over the biscuits in the casserole dish that you already just made. Layer the remaining quartered biscuit pieces over the gravy. Bake for 15 to 20 minutes or until biscuits are golden brown. Remove from oven and brush biscuits on top with melted butter.