15-Minute Oven-Baked Flounder

This simple, no-fuss, Oven-Baked Flounder recipe gives you beautifully flaky fish in just 15 minutes for a quick weeknight dinner.

This flounder fillet recipe is one of the easiest ways to serve tender, buttery fish. With just five ingredients and about 5 minutes in a hot oven, these delicate flounder fillets come out moist, flaky, and bathed in melted butter.

As a wild game chef and full-time recipe developer living in Fargo, North Dakota, I spend a lot of time teaching people how to cook fish. Some of that fish has come home with me after long days on the water. Other times, I deliberately buy fish from the grocery store because I want to develop recipes that are useful to readers wherever they live.

That is exactly what I did with this baked flounder recipe.

I have caught fresh flounder while kayak fishing with my friend Cary along the Texas coast, and there is undeniable pleasure in cooking a fish you pulled from the water yourself. You can even watch me clean a flounder in this YouTube video.

How to Clean a Flounder

But I live in Fargo, where fresh-caught flounder is hardly a Tuesday-night option. So for this recipe, I bought frozen flounder fillets at my local grocery store.

And that's the point. A good fish recipe should work for both the angler coming home with a cooler and the busy parent standing in the supermarket wondering what to make for dinner. This one does.

Why You'll Love This Baked Flounder Recipe

Flounder is mild, delicate, and extremely lean. This simple flounder recipe uses salt, olive oil, butter, and black pepper. Nothing distracts from the fish. Instead, the olive oil coats the surface while the butter melts slowly over each fillet in the oven, collecting on the parchment with the fish's natural juices.

Then, just before serving, you spoon those buttery juices right back over the top.

How to Make Oven Baked Flounder

The most important thing to understand about flounder baked in the oven is that thin fish cooks quickly. Very quickly.

A thicker piece of salmon or walleye gives you some breathing room. A 3-ounce baked flounder fillet does not.

Therefore, don't put the fish in the oven and wander off to fold laundry.

At 450 degrees F, start checking your flounder after 4 minutes. Look closely at the flesh. Raw flounder has a slightly translucent, almost glassy appearance. As it cooks, that translucency disappears and the flesh becomes opaque.

Then gently press the thickest part with a fork. When the layers begin to separate easily but the fish still looks moist, it's ready. That visual cue matters more than the clock. One fillet may need 4 minutes while a slightly thicker one needs 5 or 6.

Why Salt the Flounder Before Baking?

I salt the fish before doing anything else and let it stand for 5 minutes while the oven heats.

That short rest accomplishes two things. First, it takes some of the refrigerator chill off the fillets so they cook more evenly. Second, it gives the salt a chance to season the fish rather than merely sitting on its surface.

Five minutes may not sound significant, but with something as thin and delicate as flounder, small details make an enormous difference.

Butter Makes Better Flounder Fillets

Flounder contains very little fat of its own. Consequently, butter is more than decoration here.

Place one piece directly in the center of each fillet. Once the baking sheet hits the hot oven, the butter softens, collapses, and runs over the fish while the olive oil underneath helps keep the surface moist.

When the oven-baked flounder comes out, don't leave those buttery juices behind on the baking sheet. Spoon them over the fish. That's your sauce. And you've already made it.

A 15-Minute Fish Dinner For the Family

This is exactly the kind of dinner I love making for my wife and our 11-year-old daughter.

Our lives are busy like everyone else's. Work deadlines, school activities, appointments, and an endless number of things compete for our attention. Yet I still believe sitting down together for dinner matters.

Dinner does not need to take two hours to prepare to deserve a place at the family table. Sometimes it's eight little flounder fillets, a knob of butter melting over each one, a couple of simple sides, and 15 minutes at the table talking about the day. That's plenty. In fact, on some nights, that's everything.

Tips for the Best Baked Flounder

• Give the fillets room on the baking sheet. If you crowd them together, moisture gets trapped between them and the fish steams instead of roasting.
• Also, make sure the oven reaches the full 450 degrees F before the fish goes in. High heat is your friend when cooking thin fillets because it lets them cook quickly before they have time to dry out.
• Most importantly, watch the fish rather than blindly trusting the timer. When making any baked flounder fillet recipe, thickness matters more than weight alone.
• Finally, serve the fish immediately. Flounder is at its best when it comes straight from the oven, glossy with butter, tender enough to separate beneath a fork, and still steaming when it reaches the table.

Tested And Approved Flounder Recipe

This flounder fillet recipe, just like all of the recipes you'll find on this food blog, was tested and approved by my wife and our 11-year-old daughter. That way, you can be assured they are family-friendly.

If you are looking for another great recipe for a fish you can catch along the Gulf coast, be sure and check out our Fried Flounder or Grilled Halibut or Easy Pan Seared Redfish or Butter Poached Puffer Fish or Whole Roasted Branzino. Or find all of our fish recipes here.

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