Baked Chilean Sea Bass Recipe | Easy Basil Pesto Dinner

This baked Chilean sea bass with basil pesto tastes like a restaurant favorite, but you can make it on a weeknight. The fish bakes up buttery and flaky, and the bright, garlicky pesto melts over the top to create an herby sauce without extra work. Add a squeeze of lemon and dinner feels special with almost no cleanup.

I keep this one in my back pocket for guests and busy nights alike. The method stays simple: coat sea bass with oil and seasoning, bake until luscious, then spoon on fresh pesto to finish. Serve with roasted potatoes, blistered tomatoes, or a crisp green salad and you’re set.

Why This Baked Sea Bass with Basil Pesto Works

• Firm, rich fish stays moist: Chilean sea bass has high natural fat, so it bakes up buttery and never dries out.
• Pesto adds instant flavor: Fresh basil, garlic, and Parmesan bring brightness that cuts the richness of the fish.
• Hands-off cooking: The oven does the work. You’ll mix pesto in minutes while the fish bakes.
• Quick but impressive: From start to finish in about 25 minutes, yet it looks and tastes like a chef cooked it.
• Flexible sides: Pair with simple veggies, grains, or salad for an easy, complete meal.

Ingredients

For the Sea Bass

• 2 Chilean sea bass fillets (about 6–8 ounces each, 1 to 1.5 inches thick)
• 1 tablespoon extra-virgin olive oil
• 1/2 teaspoon kosher salt
• 1/4 teaspoon freshly ground black pepper
• 1/2 teaspoon lemon zest
• Lemon wedges, for serving

For the Basil Pesto

• 2 cups loosely packed fresh basil leaves
• 1/3 cup toasted pine nuts (or walnuts for budget-friendly)
• 1/2 cup freshly grated Parmesan cheese
• 1 small garlic clove, chopped
• 1/2 teaspoon kosher salt
• 1/4 teaspoon red pepper flakes (optional for gentle heat)
• 1/2 cup extra-virgin olive oil, plus more to taste
• 1–2 teaspoons fresh lemon juice, to brighten

How to Make Baked Sea Bass with Basil Pesto

1. Heat the oven: Set to 400°F (200°C). Line a small sheet pan with parchment for easy cleanup.
2. Dry and season fish: Pat sea bass dry with paper towels. Rub with olive oil. Sprinkle salt, pepper, and lemon zest on all sides.
3. Bake: Place fillets skin-side down if your fillets have skin. Bake 10–14 minutes depending on thickness, until the fish flakes easily and the center reaches 130–135°F for medium, or to your preferred doneness.
4. Make pesto while fish bakes: In a food processor, pulse basil, pine nuts, Parmesan, garlic, salt, and red pepper flakes until finely chopped. With the machine running, stream in olive oil until the pesto turns glossy and spoonable. Stir in lemon juice. Taste and adjust salt or lemon.
5. Finish and serve: Spoon a generous dollop of pesto over each hot fillet so it melts slightly. Add a squeeze of lemon. Serve immediately with your favorite sides.

Doneness Tips

• Thickness guides time: Start checking at 10 minutes for 1-inch fillets; add a few minutes for extra-thick pieces.
• Visual cues: The fish turns opaque and flakes in large, moist chunks when gently pressed with a fork.
• Carryover cooking: Pull the fish when it’s just shy of perfect; it will finish as it rests for 2 minutes.

How to Store Leftover Sea Bass with Pesto

• Cool first: Let leftovers cool to room temp for 15–20 minutes.
• Store separately: Keep fish and pesto in separate airtight containers to preserve texture.
• Refrigerate: Up to 2 days for the fish; pesto lasts 4–5 days.
• Freeze tips: Freeze plain baked sea bass (without pesto) up to 2 months. Thaw overnight in the fridge. Pesto freezes well in portions—use an ice cube tray.
• Reheat gently: Warm fish in a 275°F oven for 10–12 minutes or until just heated through. Add fresh pesto after reheating.

Benefits of Choosing This Easy Pesto Sea Bass

• Nutrient-dense dinner: You get quality protein and omega-3s from sea bass plus antioxidants from basil.
• Low effort, high reward: Minimal prep brings big restaurant-level flavor.
• Naturally gluten-free and low-carb: Great for a variety of eating styles and weeknight needs.
• Scales easily: Double or triple for guests without adding stress.
• Clean flavors: Lemon and basil keep the dish bright and not heavy.

Mistakes to Avoid

• Skipping the pat-dry step: Surface moisture prevents browning and dilutes flavor.
• Overbaking: Sea bass turns from silky to tough fast. Start checking early.
• Using too much garlic in pesto: One small clove gives balance; more can overpower the delicate fish.
• Forgetting acid: A little lemon in the pesto and on the fish balances richness.
• Salting late: Season before baking so the salt penetrates and enhances the fish.

Tasty Variations to Try

• Walnut pesto: Swap pine nuts for toasted walnuts for a deeper, earthier note.
• Basil-parsley blend: Use half basil, half parsley for a fresher, slightly peppery pesto.
• Creamy pesto drizzle: Whisk 2 tablespoons pesto with 1 tablespoon Greek yogurt or crème fraîche for a tangy sauce.
• Tomato boost: Roast cherry tomatoes alongside the fish and spoon them over with the pesto.
• Lemon–capers finish: Scatter 1 tablespoon drained capers and extra lemon zest on top for briny brightness.
• Grilled option: Grill the sea bass over medium-high heat 3–5 minutes per side, then top with pesto off the heat.

FAQ

Can I use store-bought pesto?

Yes. Choose a refrigerated, high-quality pesto for the best flavor. Stir in a squeeze of lemon and a touch of extra-virgin olive oil to freshen it.

What if I can’t find Chilean sea bass?

Use another thick, rich white fish like black cod (sablefish), halibut, or grouper. Adjust baking time to thickness.

Should I leave the skin on?

If your fillet has skin, leave it on for easier handling and extra moisture. Bake skin-side down, then slide a spatula between flesh and skin to serve.

How do I prevent the fish from sticking?

Line the pan with parchment, oil the fish lightly, and avoid moving it while it bakes.

Can I make the pesto ahead?

Yes. Make it up to 3 days ahead and press plastic wrap directly on the surface to limit browning. Add lemon right before serving if you prefer extra brightness.

What sides go best with this dish?

Try roasted baby potatoes, sautéed green beans, blistered tomatoes, garlicky broccolini, or a lemony arugula salad. A spoon of pesto ties everything together.

Conclusion

This baked Chilean sea bass with basil pesto nails that sweet spot of simple, elegant, and bold. You season, bake, blitz a quick pesto, and dinner lands on the table silky, fragrant, and bright. Keep good fish, fresh basil, and a lemon on hand, and you can turn any weeknight into something a little special.

Baked Chilean Sea Bass Recipe | Easy Basil Pesto Dinner

Buttery, flaky Chilean sea bass is baked and finished with a bright, garlicky basil pesto for an elegant, weeknight-friendly dinner. A squeeze of lemon ties it all together with minimal cleanup.

Print Recipe Pin Recipe

Prep Time 10 minutes mins

Cook Time 14 minutes mins

Total Time 24 minutes mins

Servings 2 fillets

Ingredients

  

Ingredients

• 2 Chilean sea bass fillets (about 6–8 ounces each, 1 to 1.5 inches thick)
• 1 tablespoon extra-virgin olive oil
• 1/2 teaspoon kosher salt
• 1/4 teaspoon freshly ground black pepper
• 1/2 teaspoon lemon zest
• Lemon wedges, for serving
• 2 cups loosely packed fresh basil leaves
• 1/3 cup toasted pine nuts (or walnuts for budget-friendly)
• 1/2 cup freshly grated Parmesan cheese
• 1 small garlic clove, chopped
• 1/2 teaspoon kosher salt
• 1/4 teaspoon red pepper flakes (optional)
• 1/2 cup extra-virgin olive oil
• 1–2 teaspoons fresh lemon juice

Instructions

 

Instructions

• Heat the oven to 400°F (200°C) and line a small sheet pan with parchment.
• Pat the sea bass dry, rub with olive oil, and season all over with salt, pepper, and lemon zest.
• Place fillets skin-side down if applicable and bake until the fish flakes easily and the center reaches 130–135°F, about 10–14 minutes depending on thickness.
• While the fish bakes, pulse basil, pine nuts, Parmesan, garlic, salt, and red pepper flakes in a food processor until finely chopped.
• With the machine running, stream in olive oil until the pesto is glossy and spoonable, then stir in lemon juice and adjust seasoning.
• Spoon pesto over the hot fillets so it melts slightly, add a squeeze of lemon, and serve immediately.

Notes

Start checking doneness at 10 minutes for 1-inch-thick fillets; thicker pieces need a few more minutes. The fish should be opaque and flake in large, moist chunks; pull it just shy of done and let it rest 2 minutes. Store fish and pesto separately; refrigerate fish up to 2 days and pesto 4–5 days. Freeze plain baked fish up to 2 months and pesto in portions. Substitute black cod, halibut, or grouper if needed, and you may use high-quality store-bought pesto with a little lemon and olive oil to freshen.