Preparing the Mushrooms:

1. Preheat the Oven:
   • Preheat your oven to 375°F (190°C).
2. Clean the Mushrooms:
   • Gently wipe the mushrooms with a damp paper towel to remove dirt. Avoid washing them under running water as they can become soggy.
3. Remove Stems:
   • Carefully remove the stems from the mushrooms, creating a cavity for the filling. Set aside the caps and discard the stems or save them for another recipe.

Making the Crab Filling:

4. Combine Ingredients:
   • In a large bowl, mix together the crab meat, cream cheese, mayonnaise, Parmesan cheese, green onions, garlic, lemon juice, Worcestershire sauce, and Old Bay seasoning. Add salt and pepper to taste.
5. Mix Until Smooth:
   • Stir the ingredients until they are well combined and the mixture is smooth.

Stuffing the Mushrooms:

6. Fill the Caps:
   • Using a spoon, generously fill each mushroom cap with the crab mixture. Make sure to pack the filling tightly into the cavities.

Preparing the Topping:

7. Mix the Topping:
   • In a small bowl, combine the panko breadcrumbs, melted butter, and chopped parsley. Stir until the breadcrumbs are evenly coated.
8. Sprinkle the Topping:
   • Sprinkle the breadcrumb mixture over the stuffed mushrooms, pressing lightly to ensure it adheres to the filling.

Baking:

9. Arrange on a Baking Sheet:
   • Place the stuffed mushrooms on a baking sheet lined with parchment paper, ensuring they are evenly spaced.
10. Bake:
    • Bake in the preheated oven for 20-25 minutes, or until the mushrooms are tender and the topping is golden brown.
11. Serve:
    • Remove from the oven and let cool for a few minutes before serving.