Preheat oven to 400 degrees F (200 degrees C). Spray a 9x13-inch baking dish with cooking spray.
Arrange trout fillets in the baking dish. Mix white wine, Dijon mustard, garlic, lemon juice, dill, and lemon-pepper seasoning in a bowl; spread over the fillets, letting some run underneath the fish.
Bake in the preheated oven until the fish is opaque and flakes easily, 10 to 15 minutes.
