In a large bowl, gently mix the crab meat with mayonnaise, egg, Dijon mustard, Worcestershire sauce, Old Bay seasoning, green onions, celery, panko, and flour until just combined. Avoid overmixing to keep the crab meat tender.
Divide the mixture into 8 equal portions and shape each into a patty about 1/2 inch thick. Place on a plate and refrigerate for at least 15 minutes to help them hold their shape.
Heat the oil in a large skillet over medium heat. Once hot, add the crab cakes in batches, making sure not to overcrowd the pan. Cook for 3–4 minutes per side, or until golden brown and heated through.
Transfer the cooked crab cakes to a paper towel-lined plate to drain excess oil. Season lightly with salt and pepper before serving, if desired.
Notes
Serve with lemon wedges and tartar sauce for a complete meal.