Preheat oven to 425°F (220°C). Line a baking sheet with parchment paper.
In a mixing bowl, whisk together egg, mayonnaise, parsley, Dijon mustard, Worcestershire sauce, Old Bay, lemon juice, and salt.
Gently fold in crab meat, trying not to break up the pieces too much.
Add saltine crumbs and mix just until combined.
Shape the mixture into about 6 crab cakes and place them on the prepared baking sheet.
Brush tops with melted butter if using.
Bake for 12–14 minutes, or until lightly crisp and golden around the edges.
Serve warm with fresh lemon wedges.