Mustard-Caper Salmon

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

Flaky salmon fillets glazed with tangy Dijon and capers for a quick, flavorful keto main. This american-inspired keto (low carb, keto) ready in about 25 minutes pairs Dijon mustard, drained capers, olive oil for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 300 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.

Prep: 10 min Cook: 15 min Serves 4 American cuisine 300 cal/serving
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Ingredients

Instructions

  1. Step 1: Preheat oven to 400°F (200°C). Place the 4 salmon fillets, skin-side down, on a baking sheet lined with parchment paper.
  2. Step 2: Season both sides of the salmon with 1/2 tsp salt and 1/4 tsp black pepper.
  3. Step 3: In a small bowl, mix 2 tbsp Dijon mustard and 1 tbsp drained capers. Spread the mixture evenly over the top of the salmon fillets.
  4. Step 4: Drizzle with 1 tbsp olive oil and bake for 12-15 minutes, until the salmon is cooked through and flakes easily with a fork.

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Frequently asked questions

How long does Mustard-Caper Salmon take to make?

Total time is about 25 minutes (10 min prep + 15 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 Mustard-Caper Salmon?

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 dijon mustard from drying out.

Can I substitute ingredients in Mustard-Caper Salmon?

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 Mustard-Caper Salmon 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.

Is Mustard-Caper Salmon low carb?

Yes — this recipe is tagged low carb, keto based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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