simply lay the beef (bone side down) in a baking dish, snuggle the ribs close together, cover tightly with aluminum foil, and cook in the oven. bake bone in short ribs in the oven at 275f for 3 1/2 - 4 hours. go the extra mile. 3 1/2 hours may be perfect in your oven, but most ovens need 4 hours.