Preheat the oven to 375°F (190°C) and lightly spray a 7x11 inch casserole dish.

Open the can of biscuits and quarter each piece. Distribute half into the baking dish and bake for 10-11 minutes.

While the biscuits are baking, heat a skillet over medium-high heat and melt 2 tablespoons of butter. Add the ground sausage and cook for 5-7 minutes until browned.

Sprinkle in flour, salt, and pepper into the cooked sausage, stirring for 1 minute. Gradually add 2 cups of milk while stirring to avoid lumps. Bring to a boil, then reduce heat and simmer for 3-4 minutes until thick.

Pour the gravy over the baked biscuits. Add the remaining biscuit quarters on top.

Return to the oven and bake for an additional 13-17 minutes, brushing the tops of the biscuits with melted butter during the last few minutes.

Let the casserole rest for a few minutes before serving in generous portions.