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Step 1
Preheat oven to 375 degrees F (190 degrees C). Prepare a 9x13-inch baking dish with nonstick cooking spray.
Step 2
Season both sides of flounder fillets with salt. Place into the prepared baking dish. Brush 1 tablespoon lemon juice over fillets.
Step 3
Mix remaining lemon juice, Parmesan cheese, melted butter, mayonnaise, and green onions in a bowl; spoon over the fillets.
Step 4
Bake flounder in preheated oven for 10 minutes. Switch oven to broil; broil fillets until the tops are just browned, 3 to 5 minutes.