Italian Sausage Stuffed Shells

Ingredients (22)

• 1 package jumbo pasta shells
• 2 tablespoons olive oil
• 1 pound Italian sausage
• 1 cup onion, chopped
• 4 cloves garlic, chopped
• 3 cups spinach
• 1 15 ounce container of ricotta cheese
• {1 cup} mozzarella cheese, shredded
• 1 cup Parmesan cheese, grated
• 1 tablespoon dried oregano
• 2 eggs, lightly beaten
• 2 teaspoons kosher salt
• 1 teaspoon freshly ground black pepper
• 16 ounce marinara sauce
• 1 cup shredded mozzarella cheese
• ½ cup Parmesan cheese

For garnish

• ½ cup Parmesan cheese
• Basil leaves
• Remaining marinara sauce