1Heat oven to 450°F. Spray cookie sheet with cooking spray. In large bowl, stir biscuit ingredients until soft dough forms. On work surface sprinkled with additional Bisquick mix, pat dough to 3/4-inch thickness. Cut with 2-inch round cutter. Reroll scraps and cut to make total of 16 rounds; place on cookie sheet. Bake 10 to 12 minutes or until golden brown.
2Meanwhile, 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.
3Split warm biscuits; spoon sausage gravy over biscuits.