Heat the oven: Preheat to 375°F (190°C). Lightly grease a small baking dish (about 1–1.5 quarts) or an 8-inch skillet.
Blend the creamy base: In a mixing bowl, beat the softened cream cheese until smooth. Stir in the sour cream and mayonnaise until fully combined and silky.
Add flavor: Mix in 1 cup of Monterey Jack, the Parmesan, garlic, Dijon, Old Bay, lemon zest, lemon juice, hot sauce, Worcestershire, and black pepper.
Taste and adjust seasoning—add more Old Bay, lemon, or hot sauce if needed.
Fold in the crab: Gently fold in the crab meat, green onions, and parsley. Do not overmix—you want some visible chunks of crab for texture.
Transfer and top: Spoon the mixture into your baking dish. Smooth the top and sprinkle with the remaining 1/4 cup Monterey Jack. Dust with a pinch of paprika if you like.
Bake: Bake for 18–22 minutes, until hot and bubbling around the edges and the top is lightly golden.
Garnish and serve: Let it rest 5 minutes.
Sprinkle with a little fresh parsley and serve warm with your favorite dippers.