Sausage Pasta Casserole

Name: Sausage Pasta Casserole
Ingredients: 2 tablespoons extra-virgin olive oil, plus more for the baking dish; Kosher salt; 1 pound rigatoni; 1 pound sweet Italian sausage, removed from the casings; 1 medium onion, sliced; 1 medium bulb fennel, trimmed, cored and sliced; 3 cloves garlic, chopped; 1/4 teaspoon red pepper flakes; 1 28-ounce can whole tomatoes, crushed by hand; 1/2 cup heavy cream; 1/2 cup fresh basil leaves, coarsely chopped; 2 cups shredded mozzarella cheese (8 ounces); 1/2 cup grated parmesan cheese (1 ounce)