Creating Cajun Stuffed Shells is a simple and enjoyable process. Just follow these steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Cook Pasta Shells: Boil a large pot of salted water and cook the pasta shells according to package instructions until al dente. Drain and set them aside to cool.
3. Prepare Filling: In a skillet over medium heat, add olive oil. Sauté the chopped onion and minced garlic until softened.
4. Brown the Meat: Add the ground sausage (or beef) to the skillet, breaking it apart with a spoon. Cook until browned and thoroughly cooked.
5. Mix the Cheese Filling: In a bowl, combine ricotta cheese, half of the mozzarella, Parmesan cheese, beaten egg, Cajun seasoning, and salt and pepper. Mix well.
6. Stuff the Shells: Fill each pasta shell with a generous scoop of the cheese and meat mixture. Place them in a greased baking dish.
7. Add Sauce: Spread the crushed tomatoes evenly over the stuffed shells. Sprinkle the remaining mozzarella cheese on top.
8. Bake: Cover the dish with foil and bake for 20 minutes. Remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and golden.
9. Cool Slightly: Let the dish cool for about 5-10 minutes before serving.
10. Garnish and Serve: Sprinkle chopped parsley on top and serve warm.

These steps will guide you in creating delicious Cajun Stuffed Shells that will wow your family and friends!