Making this incredible Crab Dip is simple when you follow these steps:

1. Preheat the Oven: Start by preheating your oven to 350°F (175°C).
2. Mix the Cream Cheese: In a large mixing bowl, combine the softened cream cheese with the mayonnaise and Dijon mustard. Use a hand mixer or spatula to blend until smooth.
3. Add the Crab Meat: Gently fold in the crab meat, being careful not to break it apart too much.
4. Incorporate Seasonings: Add the Worcestershire sauce, Old Bay seasoning, garlic powder, and black pepper to the mixture. Stir until everything is well combined.
5. Add Cheeses: Fold in the shredded cheddar cheese. If using, sprinkle the grated Parmesan on top for an extra layer of flavor.
6. Transfer to Baking Dish: Spoon the mixture into a baking dish, spreading it evenly.
7. Bake: Place the dish in the preheated oven and bake for 20 minutes, or until the dip is heated through and the top is slightly golden.
8. Garnish: Remove from the oven and sprinkle the chopped green onions on top for a fresh finish.
9. Serve: Allow it to cool slightly before serving.

With these easy steps, you’ll have a delicious Crab Dip ready to impress your guests!