Cook sausage and onion in a large skillet over medium heat until sausage is nicely browned. Drain, reserving 2 Tbsp of the drippings.
Stir in flour; cook over medium-low heat until mixture bubbles and turns golden, about 2 to 3 minutes.
Stir in milk; add seasonings; cook, stirring constantly, until thickened.
Serve hot ladled over split, freshly baked biscuits.
Makes: 4 to 6