Here is a simple and clear guide to making Stuffed Baked Mussels:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Prepare the Mussels: Place the cleaned mussels open side up on a baking dish.
3. Sauté the Aromatics: In a pan, heat olive oil over medium heat. Add chopped onions and minced garlic, cooking until translucent.
4. Mix the Stuffing: In a bowl, combine sautéed onions and garlic with breadcrumbs, Parmesan cheese, parsley, basil, lemon zest, and season with salt, pepper, and red pepper flakes if using.
5. Stuff the Mussels: Spoon the breadcrumb mixture generously onto each mussel, ensuring they are well-covered.
6. Bake: Place the stuffed mussels in the preheated oven and bake for about 15-20 minutes, or until the tops are golden brown and crispy.
7. Serve Hot: Remove from the oven and serve immediately with lemon wedges on the side.

Following these steps will help you create delightful Stuffed Baked Mussels that amaze your family and friends.