Preheat and prep. Heat your oven to 375°F (190°C).
Lightly butter a small baking dish or oven-safe skillet. Soften the cream cheese so it mixes easily.
Mix the creamy base. In a medium bowl, stir together the cream cheese, sour cream, and mayonnaise until smooth. A hand mixer makes this quick, but a sturdy spoon works too.
Add flavor. Stir in the lemon juice, Worcestershire, Cajun seasoning, smoked paprika, garlic powder, onion powder, and cayenne or hot sauce.
Taste and adjust salt and pepper. You want it boldly seasoned at this stage.
Fold in crab and cheese. Gently fold in the crab meat, shredded cheese, and green onions. Be careful not to shred the crab too much—bigger pieces are more satisfying.
Optional sauté. If using bell pepper or celery, quickly sauté in a bit of butter with a pinch of salt until tender.
Fold into the dip with the parsley if using.
Transfer and top. Spoon the mixture into the prepared baking dish. Smooth the top and sprinkle on a little extra cheese if you like.
Bake. Bake for 18–22 minutes, until the edges are bubbling and the top is lightly golden. Don’t overbake or the dip can separate.
Garnish and serve. Let it rest for 5 minutes.
Sprinkle with extra green onion or parsley. Serve warm with your favorite dippers.