
Ingredients
1 pound rigatoni
1 onion, finely diced
2 tablespoons olive oil
1 1/2 pounds Italian sausage
1 teaspoon crushed red pepper flakes
Two 25-ounce jars marinara sauce
Two 8-ounce balls fresh mozzarella, cut into large cubes
1/2 cup grated Parmesan
Minced fresh parsley, for garnish