Beat together cream cheese, mayonnaise, lemon juice and chives with a wooden spoon or stand mixer. Gently fold in crabmeat and spread in a baking dish (I used a 2-cup mini baking dish, but you could use a larger, shallow dish and bake for less time).
In a small bowl, combine breadcrumbs, melted butter and lemon zest. Sprinkle over top of dip.
Bake for about 20 min, or until bubbling hot and golden on top (it will only take maybe 10-15 minutes if a larger dish is used and dip is spread out more). Serve with baguette slices, crackers, etc.