Baked Cod with Tomato-Olive Relish and Sautéed Spinach

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

Tender baked cod fillets topped with a vibrant tomato and olive relish, served alongside garlicky sautéed spinach for a light and wholesome Whole30 dish. This Mediterranean-inspired Whole30 recipe (gluten-free), ready in about 25 minutes, pairs cod fillets, cherry tomatoes, kalamata olives 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 Whole30 week and pairs well with roasted sweet potato or a simple olive-oil salad. 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 Mediterranean cuisine 320 cal/serving
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Ingredients

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Instructions

  1. Step 1: Preheat oven to 400°F. Place 4 cod fillets in a baking dish and drizzle with 1 tbsp olive oil, seasoning with 1/2 tsp salt and 1/4 tsp black pepper.
  2. Step 2: In a medium bowl, combine 1 1/2 cups quartered cherry tomatoes, 1/2 cup sliced kalamata olives, 1/4 cup finely chopped red onion, 2 tbsp chopped parsley, 2 tbsp lemon juice, 1 tbsp olive oil, and 1/4 tsp salt. Stir gently to combine.
  3. Step 3: Spoon the tomato-olive relish evenly over each cod fillet. Bake for 12-15 minutes until fish flakes easily with a fork.
  4. Step 4: Meanwhile, heat 1 tbsp olive oil in a large skillet over medium heat. Add 4 minced garlic cloves and sauté for 30 seconds until fragrant.
  5. Step 5: Add 8 cups fresh spinach and 3/4 tsp salt to the skillet. Cook, stirring frequently, for 3-4 minutes until spinach is wilted but still bright green.
  6. Step 6: Serve baked cod topped with relish alongside the garlicky sautéed spinach.

Frequently asked questions

How long does Baked Cod with Tomato-Olive Relish and Sautéed Spinach 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 Baked Cod with Tomato-Olive Relish and Sautéed Spinach?

Refrigerate in a covered airtight container for up to 3–4 days (FDA FoodKeeper guideline for cooked fish). Store any fresh salsa or citrus-based garnish in a separate container — it keeps for up to 2 days. Freeze cooked fish (without fresh garnishes) for up to 3 months; thaw overnight in the fridge and reheat gently at 275°F until just warmed through to preserve texture.

Can I substitute ingredients in Baked Cod with Tomato-Olive Relish and Sautéed Spinach?

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 Baked Cod with Tomato-Olive Relish and Sautéed Spinach 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 Baked Cod with Tomato-Olive Relish and Sautéed Spinach whole30?

Yes — this recipe is tagged whole30, gluten-free based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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