Bake the biscuits according to the package or recipe instructions.
While the biscuits are baking, cook the sausage in a large skillet over medium heat until no pink remains.
Sprinkle the flour over the cooked sausage, stirring until the sausage is evenly coated.
Gradually add the milk to the sausage and flour mixture, stirring constantly.
Continue to cook and stir the gravy until it thickens.
Season with salt and pepper to taste.
Split the biscuits in half and serve them smothered with the sausage gravy.
Notes
When making the gravy, cook the sausage over medium heat. This will help it to cook evenly without burning.
Remember to constantly stir your gravy as it thickens to prevent it from becoming lumpy.
If your gravy becomes too thick, you can thin it out by adding a little bit more milk.
Feel free to customize your gravy with additional spices, such as garlic powder, onion powder, or thyme.
The biscuits are best served fresh out of the oven, but if you need to reheat them, do so in the oven rather than the microwave to maintain their texture.