Preheat oven to 400 degrees F.

Spray a small casserole dish with cooking spray (approximately 7x10) with cooking spray.

Cut the biscuits into quarters. Layer half of them in the prepared pan.

Bake for 10 minutes.

Now, prepare the sausage and gravy mixture. Do it while biscuits are baking or wait until after if you prefer.

In a skillet with high sides, brown the breakfast sausage until fully cooked.

Sprinkle the cooked sausage with 3 Tablespoons of flour and cook for a few minutes until absorbed.

Add milk, salt and pepper, and stir frequently until mixture comes to a slight boil and thickens a bit.

Now, make sure to taste. I usually add more pepper when I use mild breakfast sausage.

At this point, evaluate whether you need to add a little extra milk. I like the gravy to have such enough liquid to thoroughly cover all the biscuits without drowning them.

Now, pour gravy over the cooked biscuits and add the remaining uncooked biscuits over the gravy mixture.

Bake the casserole for 25 minutes or until golden brown.