Step 1: Preheat the oven to 350°F (175°C).
Step 2: In a medium mixing bowl, combine the softened cream cheese, mayonnaise, and sour cream. Mix until smooth.
Step 3: Stir in mozzarella, Parmesan, garlic powder, Worcestershire sauce, and salt and pepper. Mix until all ingredients are well combined.
Step 4: Gently fold in the crab meat and chopped green onions, being careful not to break up the crab too much.
Step 5: Spoon the mixture into a baking dish (about 8x8 inches or similar size) and spread evenly. Smooth the top.
Step 6: Bake in the preheated oven for 20-25 minutes or until the dip is hot and bubbly, with a golden-brown top.
Step 7: Remove from oven and garnish with additional green onions or chives, if desired. Serve hot with wonton chips, crackers, or tortilla chips.