Preheat the oven: Set it to 375°F (190°C). Lightly grease a small baking dish or oven-safe skillet (about 1–1.5 quarts).
Soften the cream cheese: If it’s too firm, microwave for 10–15 seconds or let it sit at room temperature until easily spreadable.
Mix the creamy base: In a medium bowl, stir together cream cheese, sour cream (or yogurt), and mayonnaise until smooth.
Add flavor: Mix in Dijon mustard, lemon juice, garlic, Old Bay, cayenne or hot sauce (if using), and a pinch of salt and pepper. Taste and adjust seasoning.
Fold in cheese and aromatics: Stir in 1 cup shredded cheese and most of the green onions and parsley, reserving a little for garnish.
Gently add crab: Fold in the crab meat with a spatula. Don’t overmix; keep some larger pieces for the best texture.
Transfer and top: Spread the mixture evenly in the baking dish.
Sprinkle a light layer of extra shredded cheese on top.
Bake: Cook for 18–22 minutes, until the dip is hot and bubbling around the edges and the top is lightly golden.
Finish and serve: Let it rest for 5 minutes. Garnish with remaining green onions and parsley. Serve warm with your favorite dippers.