In a large skillet over medium heat, brown the sausage until cooked through, 5 to 7 minutes. Sprinkle over the flour and stir until the sausage is well coated and the flour is slightly cooked, about 1 minute.
Slowly add the milk, stirring. Allow the gravy to simmer and thicken, 3 to 5 minutes. Season with the pepper, kosher salt and seasoning salt. If it gets too thick, thin to your desired consistency with additional milk.
To serve, tear a biscuit or two into bite-size pieces and place on a plate. Spoon over the sausage gravy. Serve immediately with more pepper over the top.
