Preheat oven to 400.
Grease bottom and sides of small casserole dish (7x10") with shortening or cooking spray.
Cut one can the biscuits into quarters and place in bottom of prepared pan.
Bake for 10 minutes.
Crumble and cook sausage in a large skillet over medium heat until completely cooked.
Sprinkle flour over cooked sausage. Stir and cook until flour is absorbed.
Add milk, salt and pepper. Stir until mixture thickens and begins to boil.
Add additional salt and pepper to taste.
If gravy is too thick, add up to 1/4 cup more milk.
Pour gravy over cooked biscuits.
Cut remaining can of the biscuits into quarters and place over the gravy.
Bake the casserole for 10 minutes.
Cover pan with aluminum foil and bake for 15 more minutes or until golden brown.
You can optionally brush tops of biscuits with melted butter.