Follow these straightforward steps to create your Homemade Biscuits and Gravy Casserole:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).
2. Prepare Sausage: In a large skillet over medium heat, cook the breakfast sausage until browned and crumbly.
3. Make Gravy: Stir in the flour and cook for 1-2 minutes until well combined. Gradually whisk in the milk, onion powder, garlic powder, black pepper, and salt. Continue cooking until the gravy thickens, approximately 5-7 minutes. Remove from heat.
4. Prepare Biscuits: While the gravy cooks, open the biscuit dough and cut each biscuit into quarters.
5. Layer Ingredients: In a greased 9×13-inch baking dish, layer the biscuit pieces evenly across the bottom. Pour the sausage gravy over the biscuits, making sure to cover them evenly.
6. Add Cheese: If desired, sprinkle shredded cheese over the top of the gravy.
7. Bake: Place the baking dish in the preheated oven. Bake for 35-40 minutes or until the biscuits are golden brown and the gravy is bubbly.
8. Cool: Remove from the oven and let it cool for 5-10 minutes before serving to allow the gravy to set slightly.
9. Garnish: Optionally, sprinkle chopped parsley over the top for a pop of color.

By following these simple steps, you will have an incredible casserole that showcases the wonderful flavors of homemade biscuits and sausage gravy!