Step-by-Step Instructions
Preheat your oven to 375°F (190°C) so it's ready when you are.
Melt the butter in a skillet over medium heat, then add onions and celery.
Cook for about 5 minutes until they turn soft.
Stir in the crab meat, breadcrumbs, garlic powder, parsley, salt, and black pepper.
Mix thoroughly.
Lay the flounder fillets flat and place the crab mixture onto one side.
Fold the fillets gently over the stuffing.
Place the stuffed fillets into a baking dish, squeeze fresh lemon juice over them, and sprinkle with Parmesan cheese.
Bake the stuffed flounder in the preheated oven for 30 minutes until the fish is flaky and the topping turns golden brown.