Preheat the oven to 325°F, and butter a 9 x 13-inch baking dish. Set aside.
In a small bowl, whisk together the melted butter, lemon juice, garlic, onion powder, salt, and pepper. Set aside.
4 tablespoons unsalted butter, 2 tablespoons freshly squeezed lemon juice, 2 teaspoons garlic cloves, ½ teaspoon salt, ¼ teaspoon ground black pepper, ¼ teaspoon onion powder
Pat the fillets dry with a paper towel, then place them in the prepared baking dish. Pour the butter mixture over the fillets. Sprinkle smoked paprika over the top.
1 pound flounder fillets, ½ teaspoon smoked paprika
Bake for 15 to 20 minutes (may need a few more minutes for thick fillets), or until the flounder flakes easily with a fork.
Remove from the oven, garnish with fresh parsley and lemon. Serve hot with a salad or steamed veggies.
Scroll up and see the post for tips, FAQs, and storage information.