This spinach-stuffed flounder with mushrooms and feta is a delicious and healthy seafood dish. The flounder fillets are filled with a flavorful mixture of sautéed spinach, mushrooms, and feta cheese. The combination of the tender flounder, earthy mushrooms, and creamy feta creates a mouthwatering flavor profile. This dish is perfect for a special dinner or a weeknight meal. Serve it with a side of roasted vegetables or a fresh salad for a complete and satisfying meal.