Remove the bacon or sausage once it is cooked and place on a paper towel lined plate to drain. See that brown stuff in the bottom of your pan? That's going to be your gravy!
Using the same frying pan that you cooked your bacon or sausage in, over medium-high heat, combine bacon or sausage dripping and flour; brown flour, stirring constantly with a whisk or fork.
Gradually add the milk or cream, stirring constantly until all is added, and cook until the gravy is smooth and thick. Season to taste with salt and pepper.
Serve the milk gravy hot over biscuits. Check out Mom's Biscuits and Gravy recipe.
Makes enough gravy for 10 to 12 homemade biscuits.
* You can use the drippings/grease from any meat - but bacon and sausage are the traditional ones used and preferred.
Milk Gravy Recipe: https://whatscookingamerica.net/Sauces_Condiments/MilkGravy.htm