In large skillet, over medium-high heat, cook and crumble sausage to lightly brown, removing fat from pan as it accumulates. Sprinkle flour over sausage in skillet, stir to blend, add milk to pan all at once. Cook, stirring constantly, over medium-high heat, until thickened and bubbly. Season to taste with salt and pepper. If desired, serve over hot baked biscuits or toasted English muffins or toast.