Heat the oven to 375°F (190°C). Grease a 1-quart baking dish or small cast-iron skillet.
In a large bowl, beat together cream cheese, mayonnaise, and sour cream until completely smooth.
Stir in mozzarella, Parmesan, garlic, green onions, lemon juice, Old Bay, Dijon, Worcestershire, and hot sauce. Taste and adjust salt and pepper.
Fold in the lump crab meat gently. Keep the pieces intact for the best texture.
Spread the mixture into the baking dish. Sprinkle with the remaining Parmesan.
Bake for 20–25 minutes until bubbly and lightly golden around the edges. Broil 1–2 minutes if you want extra color—watch closely.
Top with parsley. Let it rest 5 minutes, then serve warm with your favorite dippers and lemon wedges.
