In a shallow bowl, stir together panko, salt, pepper, flour, parmesan, rosemary, tarragon, and garlic powder. Set aside. In another shallow bowl, lightly whisk the egg.
Pat the fish fillets dry, as needed, and sprinkle with salt and pepper. Put the 1/4 cup of flour in a shallow bowl. Coat the fish with flour and shake off the excess. Dip the fillets, one at a time, in the egg mixture, and then the panko mixture to coat. Set aside.
Lightly coat the bottom of a skillet with a thin layer of oil, and heat over medium heat. Once the oil is hot and shiny, add the fish. Fry on each side for approximately 4-5 minutes, until golden brown. The time may vary depending on the thickness of your fish. The fish should be slightly translucent.
If the fish is extra thick, after frying place on a lightly parchment paper lined sheet pan in a 350 degree oven for approximately 5 minutes.
Remove from skillet and serve with the lemon cream sauce and/or lemon wedges.
Lemon Cream Sauce:
Melt butter in a medium saucepan over low-medium heat. Add the minced garlic and sauté until fragrant, about 20 seconds.
Pour in heavy cream and bring to a boil, whisking constantly. The sauce should thicken a little bit.
Take off the heat and stir in the lemon juice and season with black pepper and salt to your liking.