Quick Recipe Version (TL;DR)
Quick Ingredients
- 4 thick cod or halibut fillets (about 6 oz / 170 g each; 1 to 1 1/2 inches thick)
- 3/4 tsp kosher salt, plus more to taste
- 1/4 tsp black pepper
- 3 tbsp Dijon mustard
- 3/4 cup panko breadcrumbs
- 3 tbsp unsalted butter, melted (or 3 tbsp olive oil)
- 2 tbsp finely chopped fresh parsley
- 2 cloves garlic, finely grated or minced
- 1 tsp lemon zest (from 1 lemon)
- 1 tbsp lemon juice (plus lemon wedges for serving)
Do This
- 1) Heat oven to 425°F (220°C). Line a sheet pan with parchment.
- 2) Pat fish dry; season with 3/4 tsp salt and 1/4 tsp pepper.
- 3) Stir panko, melted butter, parsley, garlic, lemon zest, and lemon juice.
- 4) Set fish on pan and smear each fillet with Dijon mustard (thin, even layer).
- 5) Press breadcrumb mixture on top of each fillet.
- 6) Bake 12–16 minutes until fish flakes and reaches 145°F (63°C) in the thickest part.
- 7) Optional: broil 1–2 minutes to deepen browning. Serve with lemon wedges.
Why You’ll Love This Recipe
- Crispy-tender contrast: crunchy, buttery herb topping over juicy, flaky fish.
- Big flavor, simple steps: Dijon and lemon do most of the work.
- Fast weeknight-friendly: on the table in about 30 minutes.
- Flexible: works beautifully with cod, halibut, or other thick white fish.
Grocery List
- Produce: 1 lemon, 1 small bunch fresh parsley, 2 garlic cloves
- Dairy: unsalted butter (or skip and use olive oil)
- Pantry: Dijon mustard, panko breadcrumbs, kosher salt, black pepper, olive oil (if using)
Full Ingredients
Fish
- 4 thick cod or halibut fillets (about 6 oz / 170 g each; ideally 1 to 1 1/2 inches thick)
- 3/4 tsp kosher salt (use 1/2 tsp if your fillets are thin), plus more to taste
- 1/4 tsp freshly ground black pepper
- 3 tbsp Dijon mustard
Herb-and-Lemon Breadcrumb Topping
- 3/4 cup panko breadcrumbs
- 3 tbsp unsalted butter, melted (or 3 tbsp olive oil)
- 2 tbsp finely chopped fresh parsley
- 2 cloves garlic, finely grated or minced
- 1 tsp finely grated lemon zest (from 1 lemon)
- 1 tbsp fresh lemon juice
For Serving (Optional but Recommended)
- Lemon wedges
- Pinch of flaky salt (to finish)
- Extra chopped parsley (to garnish)
Step-by-Step Instructions
Step 1: Heat the oven and prep the pan
Arrange a rack in the center of the oven and preheat to 425°F (220°C). Line a rimmed sheet pan with parchment paper (or lightly oil the pan) for easy cleanup and to help prevent sticking.
Step 2: Dry and season the fish
Pat the fillets dry on all sides with paper towels. This helps the mustard cling and keeps the topping crisp.
Place the fish on the prepared sheet pan. Season evenly with 3/4 tsp kosher salt and 1/4 tsp black pepper.
Step 3: Mix the crunchy herb topping
In a small bowl, combine 3/4 cup panko, 3 tbsp melted butter (or olive oil), 2 tbsp chopped parsley, 2 grated/minced garlic cloves, 1 tsp lemon zest, and 1 tbsp lemon juice.
Stir until the panko looks evenly moistened and the mixture resembles a crumbly, sandy texture. If it looks dry, add 1 more teaspoon melted butter or oil.
Step 4: Spread on the Dijon “glue”
Use a spoon or small spatula to smear about 2 1/4 tsp Dijon over the top of each fillet (all 3 tbsp total). Aim for a thin, even layer. This adds flavor and helps the crumbs stick.
Step 5: Top and press for maximum crunch
Divide the breadcrumb mixture evenly over the fillets. Gently press the crumbs into the mustard so the topping adheres and bakes into a cohesive crust.
If some crumbs fall onto the pan, scoop them back onto the fish—those are the crispiest bits.
Step 6: Bake until flaky and crisp
Bake at 425°F (220°C) for 12–16 minutes, depending on thickness. The topping should be golden, and the fish should flake easily when nudged with a fork.
For best accuracy, check the thickest part with an instant-read thermometer; target 145°F (63°C).
Step 7: Optional broil and serve
If you want deeper browning, switch the oven to broil and broil for 1–2 minutes, watching closely so the crumbs don’t burn.
Rest the fish for 2 minutes, then serve with lemon wedges. Finish with a pinch of flaky salt and a little extra parsley if you like.
Pro Tips
- Choose thick fillets: The crust has time to crisp before the fish overcooks. If your fish is thinner than 1 inch, start checking at 10 minutes.
- Dry fish = better crust: Moisture is the enemy of crunch. Pat dry thoroughly before seasoning and mustard.
- Panko for the win: Regular breadcrumbs work, but panko gives a lighter, crunchier crust.
- Don’t skip the lemon zest: It perfumes the crust and keeps the flavor bright even after baking.
- Thermometer makes it foolproof: Pull at 145°F (63°C) for safe, flaky fish.
Variations
- Parmesan-herb crust: Add 1/4 cup finely grated Parmesan to the breadcrumb mixture and reduce salt by 1/8 tsp.
- Spicy Dijon: Replace half the Dijon with whole-grain mustard or add 1/4 tsp cayenne to the breadcrumbs.
- Mayo-mustard swap: For an extra-rich layer, use 1 1/2 tbsp Dijon + 1 1/2 tbsp mayonnaise on the fish.
Storage & Make-Ahead
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat on a sheet pan at 325°F (163°C) for 8–12 minutes, until warmed through; this helps keep the topping crisp (microwaving will soften it). You can mix the breadcrumb topping up to 24 hours ahead and refrigerate it in a sealed container; bring it to room temperature for 10 minutes before topping the fish.
Nutrition (per serving)
Approximate (using cod and butter): 360 calories, 38 g protein, 14 g carbohydrates, 16 g fat, 1 g fiber, 1 g sugar, 520 mg sodium.
