Delicious Spinach and Ricotta Stuffed Shells for a Hearty Dinner! Ingredients: 12 large pasta shells 1 cup ricotta cheese 1 cup fresh spinach, chopped 1/2 cup grated Parmesan cheese 1 cup marinara sauce (plus extra for serving) 1 cup shredded mozzarella cheese 1 egg, beaten 1 teaspoon garlic powder 1 teaspoon Italian seasoning Salt and pepper to taste