Preheat your oven to 350°F. Grease a 24-cup mini muffin pan with cooking spray.
In a large bowl, mix together the crab meat, cream cheese, beaten egg, 1/3 cup Parmesan cheese, 1 teaspoon Old Bay seasoning, 1/4 cup sour cream, lemon zest, 1 teaspoon lemon juice, cayenne pepper, and about 1 tablespoon of chopped chives. Season with salt and pepper, stirring until well combined.
In another bowl, combine the remaining Parmesan cheese, panko bread crumbs, and melted butter. Divide this mixture between the muffin pan cups, pressing it around the edges to form a crust. Spoon the crab mixture evenly into each cup.
Bake until the edges turn golden, about 20 to 25 minutes.
While the crab cake bites are baking, prepare the dipping sauce. Combine 1/2 cup sour cream, the remaining chopped chives, 1 teaspoon lemon juice, and the remaining Old Bay seasoning. Stir well to combine.
Serve the crab cake bites warm or at room temperature with the dipping sauce on the side. Enjoy every flavorful bite!