Rich and Comforting Creamy Beef Shells Casserole

材料

1 lb (450 g) ground beef

1 small onion, diced

2 cloves garlic, minced

2 cups (500 ml) beef broth

1 cup (240 ml) heavy cream

1 can (14.5 oz) diced tomatoes

2 cups (200 g) shell pasta

1 cup (100 g) shredded cheddar cheese

1 tablespoon olive oil

1 teaspoon dried basil