Baked Cod Butternut Spinach

Featured in: Wholesome Bakes

Enjoy tender cod fillets gently baked over sweet roasted butternut squash cubes and fresh baby spinach. The vibrant tomato-herb sauce, enriched with oregano, thyme, and a hint of smoked paprika, brings warmth and depth to this wholesome dish. Simple steps include roasting squash to soften, simmering a fragrant sauce, layering fresh ingredients, and baking until the fish flakes with ease. Ideal for nutritious weeknight meals or light entertaining.

Updated on Mon, 17 Nov 2025 08:09:00 GMT
Golden-brown Baked Cod, nestled with roasted squash and spinach in a rich tomato-herb sauce. Save
Golden-brown Baked Cod, nestled with roasted squash and spinach in a rich tomato-herb sauce. | oventhyme.com

Tender cod fillets baked atop sweet roasted butternut squash and wilted spinach, all nestled in a vibrant tomato-herb sauce. A wholesome, flavorful meal perfect for weeknights or entertaining.

I first made this dish as a cozy dinner for my family after a busy day. The combination of sweet squash and tangy tomato sauce with flaky cod became an instant favorite at our table.

Ingredients

  • Cod fillets: 4 fillets, about 150 g (5 oz) each, skinless and boneless
  • Butternut squash: 500 g (1 lb), peeled and cut into 1.5 cm (½-inch) cubes
  • Fresh baby spinach: 120 g (4 cups)
  • Yellow onion: 1 medium, finely chopped
  • Garlic: 2 cloves, minced
  • Canned crushed tomatoes: 400 g (14 oz)
  • Tomato paste: 2 tbsp
  • Olive oil: 2 tbsp, divided
  • Dried oregano: 1 tsp
  • Dried thyme: 1 tsp
  • Smoked paprika: ½ tsp (optional)
  • Sea salt: ½ tsp, plus more to taste
  • Black pepper: ¼ tsp, freshly ground, plus more to taste
  • Sugar or maple syrup: 1 tsp (optional, to balance acidity)
  • Fresh parsley: 2 tbsp, chopped, plus extra for garnish
  • Lemon wedges: For serving
  • Freshly cracked black pepper: For serving

Instructions

Prepare oven and baking dish:
Preheat the oven to 200°C (400°F). Lightly grease a large ovenproof dish.
Roast butternut squash:
Toss the butternut squash cubes with 1 tbsp olive oil, a pinch of salt, and pepper. Spread evenly in the baking dish. Roast for 15 minutes, until just starting to soften.
Sauté onion and garlic:
While the squash roasts, heat 1 tbsp olive oil in a skillet over medium heat. Sauté the onion for 3, 4 minutes until translucent. Add garlic and cook for 1 minute more.
Make tomato-herb sauce:
Stir in the tomato paste, cook for 1 minute, then add crushed tomatoes, oregano, thyme, smoked paprika, salt, pepper, and sugar or maple syrup if using. Simmer for 5 minutes to develop flavor.
Layer vegetables and sauce:
Remove the squash from the oven. Scatter spinach over the squash, then pour the tomato-herb sauce evenly over the vegetables.
Add cod fillets:
Nestle the cod fillets on top. Season the fish lightly with salt and pepper. Cover the dish loosely with foil.
Bake:
Bake for 15, 18 minutes, or until cod is opaque and flakes easily with a fork.
Garnish and serve:
Remove foil, sprinkle with fresh parsley, and serve with lemon wedges.
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| oventhyme.com

This dish has become a comforting family favorite. The aroma of roasted squash and herbs draws everyone to the table together.

Recipe Notes

Substitute cod with haddock, pollock, or halibut if preferred. For a heartier meal, serve alongside quinoa, brown rice, or crusty gluten-free bread. Add a touch of chili flakes for gentle heat, if you like.

Required Tools

Large ovenproof baking dish, skillet, chefs knife, cutting board, foil.

Allergen & Nutrition Information

Contains fish. Recipe is gluten-free as written. Always check packaged products for possible allergens. Per serving: 295 calories, 7 g total fat, 23 g carbohydrates, 34 g protein.

A close-up of flaky Baked Cod, served with vibrant vegetables and herbed tomato sauce alongside. Save
A close-up of flaky Baked Cod, served with vibrant vegetables and herbed tomato sauce alongside. | oventhyme.com

Enjoy this lively, wholesome Mediterranean-inspired cod bake as a nutritious centerpiece that brings everyone together.

Kitchen Guide

Can I substitute cod with another fish?

Yes, haddock, pollock, or halibut make excellent alternatives with similar texture and flavor.

How do I know when the fish is perfectly cooked?

The cod is done when it turns opaque and flakes easily with a fork.

Can I add spice to the dish?

Adding a pinch of chili flakes during cooking offers a gentle heat that complements the tomato-herb sauce.

What sides pair well with this dish?

Quinoa, brown rice, or gluten-free crusty bread enhance the heartiness without overpowering flavors.

How should leftovers be stored?

Keep leftovers refrigerated in a sealed container for up to two days to maintain freshness.

Baked Cod Butternut Spinach

Tender cod and roasted butternut squash combine with fresh spinach in a rich tomato-herb sauce.

Prep duration
20 min
Kitchen time
35 min
Complete duration
55 min
Created by Grace Mitchell


Skill level Easy

Heritage Mediterranean-Inspired

Output 4 Portions

Dietary requirements No dairy, No gluten, Reduced-Carb

What you'll need

Fish & Vegetables

01 4 skinless, boneless cod fillets (approximately 5 ounces each)
02 1 pound butternut squash, peeled and cut into ½-inch cubes
03 4 cups fresh baby spinach
04 1 medium yellow onion, finely chopped
05 2 garlic cloves, minced

Tomato-Herb Sauce

01 14 ounces canned crushed tomatoes
02 2 tablespoons tomato paste
03 2 tablespoons olive oil
04 1 teaspoon dried oregano
05 1 teaspoon dried thyme
06 ½ teaspoon smoked paprika (optional)
07 ½ teaspoon sea salt, plus more to taste
08 ¼ teaspoon freshly ground black pepper
09 1 teaspoon sugar or maple syrup (optional)
10 2 tablespoons fresh parsley, chopped

For Serving

01 Lemon wedges
02 Freshly cracked black pepper

Method

Phase 01

Preheat and Prepare Baking Dish: Preheat oven to 400°F. Lightly grease a large ovenproof dish.

Phase 02

Roast Butternut Squash: Toss butternut squash cubes with 1 tablespoon olive oil, a pinch of salt and pepper. Spread evenly in the baking dish and roast for 15 minutes until slightly softened.

Phase 03

Sauté Aromatics: Heat 1 tablespoon olive oil in a skillet over medium heat. Sauté chopped onion for 3 to 4 minutes until translucent, then add minced garlic and cook for 1 more minute.

Phase 04

Prepare Tomato-Herb Sauce: Stir in tomato paste and cook for 1 minute. Add crushed tomatoes, oregano, thyme, smoked paprika, salt, pepper, and sugar or maple syrup if using. Simmer for 5 minutes to enhance flavors.

Phase 05

Assemble Vegetables and Sauce: Remove butternut squash from oven. Scatter fresh spinach over it, then pour tomato-herb sauce evenly atop the vegetables.

Phase 06

Add Cod Fillets and Season: Nestle cod fillets on top of the vegetable mixture. Lightly season the fish with salt and freshly ground black pepper. Cover loosely with foil.

Phase 07

Bake Until Cooked: Bake covered for 15 to 18 minutes, or until cod is opaque and flakes easily with a fork.

Phase 08

Garnish and Serve: Remove foil, sprinkle chopped fresh parsley over the top, and serve with lemon wedges alongside freshly cracked black pepper.

Kitchen tools needed

  • Large ovenproof baking dish
  • Skillet
  • Chef's knife
  • Cutting board
  • Aluminum foil

Allergy notes

Always review ingredients for potential allergens and seek professional medical advice when uncertain.
  • Contains fish. Gluten-free as prepared. Verify all packaged ingredients for potential allergens.

Nutrition breakdown (per portion)

Values shown are estimates only - consult healthcare providers for specific advice.
  • Energy: 295
  • Fats: 7 g
  • Carbohydrates: 23 g
  • Proteins: 34 g