In 10-inch skillet, heat oil over medium-high heat. Cook onions and garlic in oil; simmer uncovered about 2 minutes, stirring occasionally. Remove with slotted spoon. Add beef to skillet; cook about 5 minutes or until browned. Stir in onions and garlic, tomato paste, tomatoes, mushrooms, wine, oregano, basil and bay leaf. Cover; simmer about 25 minutes or until meat is tender. Stir in bell pepper; remove bay leaf.