Making Creamy Crab Stuffed Mushrooms is a cinch when you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C) to prepare for baking the stuffed mushrooms.
2. Prepare the Mushrooms: Gently clean the mushrooms with a damp paper towel. Remove the stems and set the caps aside. Finely chop the stems for later use.
3. Cook the Filling: In a skillet over medium heat, sauté the chopped mushroom stems, green onions, and garlic until softened, about 3-4 minutes.
4. Mix the Filling: In a mixing bowl, combine the cooked vegetables, crab meat, cream cheese, Parmesan cheese, Worcestershire sauce, Dijon mustard, Old Bay seasoning, salt, and pepper. Mix until well combined.
5. Stuff the Mushrooms: Using a small spoon, generously fill each mushroom cap with the crab mixture, ensuring they are packed well.
6. Optional Topping: If desired, sprinkle breadcrumbs on top of the stuffed mushrooms for a crunchy texture.
7. Bake: Arrange the stuffed mushrooms on a baking sheet lined with parchment paper. Bake for about 20 minutes or until the mushrooms are tender and the topping is golden brown.
8. Garnish and Serve: Once baked, remove from the oven and let cool for a few minutes. Garnish with freshly chopped parsley before serving.

These steps will guide you seamlessly in making amazing Creamy Crab Stuffed Mushrooms.