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Baked Flounder with Lemon Garlic and Butter

Baked Flounder with Lemon Garlic and Butter is an easy dinner that goes from prep to table in under 30 minutes. The fish is buttery, flaky, and full of fresh citrus and garlic flavors.

Who doesn’t love an easy meal that’s big on flavor? We are big fans of quick and easy dishes that use fresh herbs, citrus, and spices to add flavor without a lot of fuss.

Baked flounder with lemon garlic and butter is one of those meals. The flounder is baked in a lemon butter sauce filled with fresh garlic, onion powder, salt, and pepper.

Then the fish is sprinkled with smoked paprika for an extra touch. Flounder is a light, white fish that flakes beautifully and pairs well with vegetables or salad for an easy dinner.

Much like our oven baked Mahi Mahi, Chilean Sea Bass and baked cod with Panko, this recipe comes together quickly and bakes up in no time! I love that it bakes in one pan, so cleanup is super easy.

Baked Flounder with Lemon Garlic and Butter with blanched broccoli.

How to Make Baked Flounder with Lemon Garlic and Butter:

Start by preheating the oven, and buttering a 9 x 13-inch baking dish. Set aside. Since the fish is usually on the thinner side and it’s delicate, we bake it on a lower temperature of 325°F.

In a small bowl, whisk together the melted butter, lemon juice, garlic, onion powder, salt, and pepper. Please use freshly squeezed lemon juice and not imitation.

Pat the fish fillets dry with a paper towel, and check for any small bones. Lay the fillets in the prepared baking dish.

Collage style photo showing the first 3 steps of making baked flounder.

It’s okay to overlap the fish if it doesn’t fit in an even layer as long as all the fillets are in an even layer. Pour the lemon butter mixture over the fish.

Sprinkle the flounder with smoked paprika, and bake for 15 to 20 minutes or until the fillets flake easily with a fork. Depending on the thickness of the fish, it may need to bake it for a couple extra minutes.

Serve the baked flounder immediately with a drizzle of the lemon butter and garlic, extra lemon wedges, fresh vegetables, or a side salad.

Collage style photo of flounder fillets in baking dish with butter sauce.

What goes with baked flounder?

Baked flounder goes great with lighter side dishes. Here are some favorites:
Roasted Potatoes
Mashed Sweet Potatoes
Dill Potatoes
Sautéed Broccoli
Spinach Salad

How do you bake fish without drying it out?

Make sure to cook the fish at the correct time and temperature for the variety that you’re baking. Although, most fish varieties cook at similar oven temperatures, they can vary slightly. The thickness and texture of the fish is also important. Less oily fish tend to dry out more easily than fattier fish like salmon or sea bass.

How do you know when flounder is cooked?

Baked flounder will be white and flake easily with a fork when it’s finished baking. Additionally, the internal temperature should range between 140° – 145°F on an instant read thermometer.

Can you use frozen fillets for baked flounder with lemon garlic and butter?

We used frozen fillets that had been thawed and patted dry, and don’t recommend using completely frozen fillets. Fresh fillets are the best bet if you’re able to locate them.

Do you have to use a lemon garlic and butter sauce?

No, there are a ton of ways to flavor flounder. Here’s a recipe for Spicy Garlic Soy Baked Flounder in a Foil Pouch that uses Asian-inspired flavors.

You can also use olive oil, salt, and pepper with some fresh lemon juice at the end. Anything that’s light and flavorful will work well without overpowering the fish.
Baked flounder with lemon wedges.

Don’t forget to check out our Baked Flounder web story!

Top down view of flounder with lemon and broccoli.

Baked Flounder with Lemon Garlic and Butter

4.4 from 132 votes
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Prep Time: 10 minutes
Cook Time: 20 minutes
Total Time: 30 minutes
Servings: 1 Pound
Calories: 205kcal

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  • 4 Tablespoons Unsalted Butter melted
  • 2 Tablespoons Fresh Lemon Juice
  • 2 Teaspoons Garlic minced or pressed (about 3 small cloves)
  • ½ Teaspoon Salt or to taste
  • ¼ Teaspoon Pepper
  • ¼ Teaspoon Onion Powder
  • 1 Pound Flounder Fillets patted dry with paper towels
  • ½ Teaspoon Smoked Paprika


  • 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.
  • 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.
  • 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.


*The calories listed are an approximation based on the ingredients in the recipe card and a serving size of ¼ pound of flounder. Actual calories will vary.
*For more information, tips, and answers to frequently asked questions, please refer to the post.


Calories: 205kcal | Carbohydrates: 1g | Protein: 18g | Fat: 14g | Saturated Fat: 8g | Polyunsaturated Fat: 5g | Cholesterol: 94mg | Sodium: 678mg
Recipe Rating


Sunday 3rd of July 2022

Had this tonight! I added a light layer of Panko to the top. My husband likes a little crunch. Was delicious! Served with garlicky couscous, sauted vegetables and a nice mixed salad. Spooned the pan juices over the couscous. Yum! Nothing but a delicious memory now. Thank you for sharing


Monday 4th of July 2022

Thank you Cathy, Kim and I are thrilled you and your husband enjoyed the flounder. That sounds like a wonderful meal! Have a lovely day :)

Friday 8th of April 2022


Sunday 30th of January 2022

My husband and I had this for dinner tonight and we were not impressed with the flavors. I think we will stay with the bolder flavors of blackened seasoning.


Monday 31st of January 2022

Hi Gebbie!

Blackened seasoning would taste great. Hope that works out better for you. Have a wonderful week! :)


Friday 24th of December 2021

This was great! Made it, ate some and added the rest to a seafood casserole with other seafood!


Wednesday 3rd of November 2021

In the oven now! I never bake fish for my hubby of 35 years and he is so excited!


Wednesday 3rd of November 2021

Hi Debbie!

We hope you and your husband enjoy it! It's one of our favorites. Have a wonderful evening! :)