Creating Corsican Stuffed Mussels involves a series of straightforward steps. Follow this guide for a successful dish:

1. Clean the Mussels: Rinse the mussels thoroughly under cold water, scrubbing the shells to remove any dirt. Discard any that remain open after tapping them.

2. Prepare Filling: In a bowl, combine breadcrumbs, minced garlic, chopped onion, grated Parmesan cheese, parsley, olive oil, lemon juice, salt, pepper, and red pepper flakes if using.

3. Stuff the Mussels: Open each mussel shell and fill each half with the breadcrumb mixture generously, pressing down to pack it in tightly.

4. Preheat the Oven: Preheat your oven to 200°C (392°F).

5. Arrange Mussels: Place the stuffed mussels on a baking tray, ensuring they are not overcrowded.

6. Bake Mussels: Bake in the preheated oven for about 15-20 minutes or until the breadcrumbs are golden brown and the mussels are steaming.

7. Garnish and Serve: Remove from the oven and sprinkle with fresh herbs for added flavor.

8. Enjoy: Serve hot, with lemon wedges on the side for extra zest.

By following these steps, you will create a culinary delight that captures the essence of Corsican cooking.