Stuffed Bell Pepper Casserole

Name: Stuffed Bell Pepper Casserole
Prep time: 20 min
Cook time: 25 min
Total time: 45 min
Cuisine: American
Ingredients: 1 tablespoon olive oil; 1/2 yellow onion; 1 cup white rice (uncooked); 1 pound ground beef; 2 teaspoons freshly minced garlic; 2 green bell peppers, diced; 1/4 cup tomato paste; 1 (14.5 oz) can petite diced tomatoes, drained; 2 tablespoons Worcestershire sauce; 1/4 cup shredded mozzarella cheese; 1/4 cup shredded cheddar cheese; Salt & pepper to taste