Drain crab well, then gently pick through to remove any bits of shell.
Whisk mayonnaise, egg, Dijon, Worcestershire, seafood seasoning, lemon juice, lemon zest, salt, and pepper in a bowl.
Fold in crab, parsley, and green onion until just combined. Sprinkle in crumbs and mix lightly to bind.
Form 8 patties about 2½ inches wide. Chill 15 minutes to firm up.
Heat oil in a large skillet over medium heat until shimmering.
Cook crab cakes 3–4 minutes per side until deep golden and heated through.
Drain briefly on a rack or paper towels. Serve hot with lemon wedges or your favorite sauce.