Garlic Butter Baked Tilapia

Baked tilapia is one of my favourite quick dinners, and this garlic butter version is the one I make most often. The sauce is a simple mix of melted butter, fresh garlic, lemon juice, paprika, and parsley, but it turns mild white fish into something rich, flaky, and full of flavour in just 20 minutes. Everything goes into one pan, there’s no flipping, no splattering, and no complicated technique. The garlic butter soaks right into the fish as it bakes, so every bite is savoury and tender all the way through.

All Ingredients you need

Tilapia fillets — I always look for fillets that are firm, moist, and have no fishy smell. If they smell strongly at the store, I skip them and come back another day. I prefer fresh tilapia when I can find it, but frozen works just as well here. If you’re using frozen, thaw the fillets completely in the refrigerator overnight, then rinse them under cold water and pat them very dry with paper towels before seasoning. Skipping that step is the most common reason baked tilapia turns out watery instead of flaky.

Unsalted butter — I always use unsalted butter in this recipe because it gives me full control over the saltiness. I melt it first and whisk it directly into the sauce rather than dotting it on top of the fish. That way the garlic butter coats every part of the fillet evenly as it bakes.

Fresh garlic — I never skip fresh garlic here. Garlic powder works in a pinch but it doesn’t give you the same depth of flavour in the sauce. I mince it finely so it distributes evenly and doesn’t overpower any one bite.

Lemon juice — I always use fresh lemon juice, not bottled. The difference in brightness is noticeable, especially in a sauce this simple where lemon is doing a lot of the work. If you don’t have a lemon on hand, lime juice works too. I also like to add a few thin lemon slices on top of the fish before baking for extra flavour and a nice presentation.

Paprika — I use regular sweet paprika here, not smoked or hot. It adds a subtle warmth and a little colour to the garlic butter sauce without changing the flavour direction of the dish.

Fresh parsley — I add it to the sauce before baking and use a little more as a garnish at the end. Dried parsley works if that’s what you have, but fresh gives you a cleaner, brighter finish.

How to Make Baked Tilapia

Preheat the oven and prep your pan. I preheat to 425°F and grease a 9×13 baking dish with cooking spray before I do anything else. Getting the oven fully preheated matters with fish. Tilapia is thin and cooks fast, so you want the heat to be consistent from the moment the pan goes in.

Make the garlic butter sauce. In a small bowl, whisk together the melted butter, minced garlic, lemon juice, paprika, onion powder, and chopped parsley until well combined. I always taste the sauce at this point and adjust the lemon if needed. Since the fish itself is very mild, the sauce carries most of the flavour, so it’s worth getting it right before it goes on.

Season the fillets. Pat the tilapia dry with paper towels, then arrange the fillets in a single layer in the prepared baking dish. Season well with salt and black pepper on both sides. I never skip this step, even with a flavourful sauce on top. The seasoning underneath is what keeps the fish from tasting flat.

Pour the sauce and bake. Pour the garlic butter mixture evenly over the fillets, making sure every part of the fish is coated. Bake for 10 to 12 minutes. You’ll know it’s done when the flesh turns opaque and flakes easily when you press it gently with a fork at the thickest part. There’s no need to flip the fillets at any point.

Optional broil for a golden finish. If you want a little colour on top, switch the oven to broil for the last 1 to 2 minutes. Keep a close eye on it since tilapia goes from golden to overdone very quickly under the broiler.

How Long to Bake Tilapia:

Tilapia bakes quickly, which is one of the reasons I love it for weeknights.

At 425°F, most fillets are done in 10 to 12 minutes. The exact time depends on thickness, so I always check at the 10-minute mark by pressing the thickest part of the fillet with a fork. If it flakes easily and the flesh is opaque all the way through, it’s ready.

The most reliable way to check is with a meat thermometer. Insert it sideways into the thickest part and look for an internal temperature of 145°F. Pull the fish at 140°F if you prefer it just slightly less firm, it will finish cooking as it rests.