Brown sausage over medium heat in an 8" skillet crumbling as it browns. Cook until no trace of pink appears and some of the crumbles are lightly browned on the edges.
Remove with a slotted spoon and place on paper towels to drain. Let skillet cool for two to three minutes and drain off any excess grease.
Stir flour into milk and whisk until no lumps remain. Add to skillet and return to medium heat, stirring to scrape bits left from bottom and sides of skillet.
Continue cooking and stirring over medium heat until thickened. Stir in salt and pepper and then add sausage crumbles back to skillet until well combined.
Serve hot gravy over warm, split biscuits.
Notes
This makes enough gravy to cover 5-6 medium biscuits which has been split.
An 8" skillet cast iron skillet is ideal for the amount of sausage gravy made by this recipe.
If mild sausage is used and additional spiciness is desired add red pepper flakes to taste.
If additional herb flavoring is desired add additional sage to taste.