Heat oven to 375°F and lightly grease a 1-quart baking dish.
Beat cream cheese in a bowl until smooth. Stir in mayonnaise and sour cream until creamy.
Whisk in lemon juice, Worcestershire, hot sauce, Cajun seasoning, garlic, salt, and pepper.
Fold in crab, green onions, red bell pepper, Parmesan, and half the pepper jack. Keep the crab pieces chunky.
Spread mixture in the dish. Sprinkle with remaining pepper jack and dust with smoked paprika.
Bake until hot and bubbling at the edges, 18–20 minutes. Broil 1–2 minutes to brown the top if desired.
Rest 5 minutes. Garnish with parsley and serve warm with crackers, crostini, or celery sticks.