Creating stuffed baked mussels is straightforward if you follow these clear steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Prepare the Mussels: Clean the mussels thoroughly under running water and discard any that are cracked or open. Place them on a baking sheet, shell side down.
3. Make the Stuffing: In a medium bowl, combine the breadcrumbs, Parmesan cheese, olive oil, minced garlic, chopped parsley, red pepper flakes, salt, and black pepper. Mix until well combined.
4. Fill the Mussels: Spoon the breadcrumb mixture evenly onto each mussel, ensuring each one is generously topped.
5. Bake the Mussels: Place the baking sheet in the preheated oven and bake for 15-20 minutes or until the tops are golden brown and crispy.
6. Check for Doneness: Look for bubbling around the edges and a golden crust on top for an ideal result.
7. Garnish with Lemon: Once baked, remove from the oven and garnish with lemon wedges for a fresh touch.

These simple steps will guide you in creating stuffed baked mussels that are sure to wow everyone.