Chicken Chesapeake

Name: Chicken Chesapeake
Ingredients: 2 skinless, boneless chicken breasts (about 8 ounces each); Kosher salt and freshly ground pepper; 1 1/2 teaspoons Old Bay Seasoning; 1 tablespoon instant flour (such as Wondra), plus more for dredging; 3 tablespoons vegetable oil; 1 large egg; 2 tablespoons mayonnaise; 2 1/2 teaspoons Dijon mustard; 1/2 teaspoon Worcestershire sauce; 8 ounces jumbo lump crabmeat, picked over for shells; 1/4 cup chopped fresh parsley; 3/4 cup shredded white cheddar cheese; 1 tablespoon unsalted butter; 1 cup whole milk; 1 teaspoon fresh lemon juice, plus wedges for serving