In a medium-sized mixing bowl, whisk together Old Bay seasoning, parsley, baking powder, dijon mustard, worcestershire sauce, mayonnaise, egg, and lemon. Then add the crab and panko bread crumbs. Cover and refrigerate for 30 minutes.
Preheat the oven's broiler on high and form the crab mixture into 4 large, even sized balls. Place on a lightly greased baking sheet and brush the melted butter over top of each one. Place the baking sheet about 4 inches from the broiler and broil for 3-5 minutes, or until the crab cakes are golden brown.
Serve the crab cakes with lemon wedges and Old Bay tartar sauce. Garnish with fresh parsley if desired.
Crab Cake Sauce
In a small bowl, whisk together the tartar sauce, Old Bay seasoning, lemon juice, and worcestershire sauce.
Notes
Don't skip the butter! It's what makes them nice and golden brown.
I have skipped the 30 minute chill time for the crab mixture many times and they've turned out just fine, so don't worry if you forget or don't have time!