Crumble sausage into large saucepan, cook over medium-low heat.
Add onion, cook and stir until transparent. Drain, discarding all but 2 tablespoons of drippings.
Stir in flour, cook over medium-low heat for about 2-3 minutes or until mixture bubbles and turns golden.
Stir in milk. Add seasonings, cook, stirring until thickened.
To serve, slice biscuits and spoon gravy over halves.