Oven-Roasted Cod with English Mustard and Parsley Butter
Tender cod fillets oven-roasted with a tangy English mustard and parsley butter, served with buttery new potatoes. This british-inspired seafood ready in about 45 minutes pairs fillets (6 oz each) cod fillets, English mustard, softened unsalted butter for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 320 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.
Ingredients
- 4 fillets (6 oz each) cod fillets
- 2 tbsp English mustard
- 4 tbsp softened unsalted butter
- 2 tbsp finely chopped fresh parsley
- 1 lb halved new potatoes
- 1 tbsp olive oil
- to taste sea salt
- to taste black pepper
- for serving lemon wedges
Instructions
- Step 1: Preheat the oven to 400°F (200°C). Toss 1 lb halved new potatoes with 1 tbsp olive oil, sea salt, and black pepper. Spread on a baking sheet and roast for 25 minutes until tender and golden.
- Step 2: While potatoes roast, mix 2 tbsp English mustard with 4 tbsp softened unsalted butter and 2 tbsp finely chopped fresh parsley in a small bowl until well combined.
- Step 3: Place 4 cod fillets on a parchment-lined baking tray. Season with sea salt and black pepper, then spread the mustard-parsley butter evenly over the top of each fillet.
- Step 4: Roast the cod fillets in the oven alongside the potatoes for 12-15 minutes until the fish is opaque and flakes easily with a fork.
- Step 5: Serve the cod immediately with the roasted new potatoes and lemon wedges for squeezing over.
Frequently asked questions
How long does Oven-Roasted Cod with English Mustard and Parsley Butter take to make?
Total time is about 45 minutes (15 min prep + 30 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.
How do I store leftover Oven-Roasted Cod with English Mustard and Parsley Butter?
Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep english mustard from drying out.
Can I substitute ingredients in Oven-Roasted Cod with English Mustard and Parsley Butter?
Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.
How do I scale Oven-Roasted Cod with English Mustard and Parsley Butter for a different number of people?
The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.
What goes well with Oven-Roasted Cod with English Mustard and Parsley Butter?
British seafood like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.
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