Cheesy Sausage Casserole

2 lbs Italian sausage , casings removed (mild or spicy) 2 -3 tablespoons olive oil 2 teaspoons dried chili pepper flakes (optional) 1 large onion , chopped 1[...]

450 g rotini pasta 1 cup broccoli , chopped 1 (796 ml) can diced tomatoes (do not drain!) 1 1/2 cups grated sharp cheddar cheese 5 cooked Italian sausages,[...]

1 lb Italian sausage (casings removed, can use more if desired) 1 medium onion , finely chopped 3 tablespoons oil or 3 tablespoons butter 1 (10 ounce) can[...]