Meanwhile, in 12-inch skillet, cook sausage and onion over medium heat 8 to 10 minutes, stirring occasionally, until pork is no longer pink. With slotted spoon, remove sausage mixture. Reserve 1 tablespoon drippings; add oil to drippings. Heat over medium heat. Stir in flour, dried sage, salt, onion powder and red pepper with wire whisk. Cook 1 minute, stirring constantly, until smooth and bubbly. Gradually add milk, stirring constantly, until mixture boils and thickens. Stir in sausage mixture.