Created by KittenCal on September 30, 2011
Step 1: Preheat oven to 375 degrees F.
Step 2: Grease a 13 x 9-inch baking dish.
Step 3: Cook pasta shells according to package directions; drain in a colander then place in a bowl.
Step 4: Gently toss cooked shells with oil to prevent sticking; set aside.
Step 5: In a large bowl stir the ricotta cheese with 1-1/2 cups mozzarella cheese, Parmesan, spinach, egg, Italian seasoning, garlic powder, nutmeg, seasoned salt, black pepper and if using the cayenne pepper.
Step 6: Spread about 1 cup spaghetti sauce over bottom of baking dish.
Step 7: Stuff shells with the spinach mixture and place in dish.
Step 8: Spoon remaining 2-1/2 cups sauce over shells and sprinkle with remaining 1-1/2 cups mozzarella.
Step 9: Cover baking dish with foil and bake for 35 minutes.
Step 10: Remove foil and bake about 10-15 minutes longer until bubbly and cheese begins to brown.