How many servings does this recipe make?

This recipe makes 4 servings. You can adjust the portion size directly on this page.

What ingredients do I need for Fish Casserole?

You need 10 ingredients. The key ingredients include: 1 clove garlic, 1 Tbsp. margarine or butter, 1 (10 oz.) pkg. frozen leaf spinach, thawed and liquid pressed out, 1 lb. haddock fillets, and more.

Is Fish Casserole suitable as seafood?

Yes, Fish Casserole falls under the Seafood category and is a great choice for this type of meal.

How do I store leftover Fish Casserole?

Store leftovers in an airtight container in the refrigerator for up to 3–4 days. Reheat gently before serving.

Fish Casserole Recipe

Name: Fish Casserole
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 1 clove garlic; 1 Tbsp. margarine or butter; 1 (10 oz.) pkg. frozen leaf spinach, thawed and liquid pressed out; 1 lb. haddock fillets; salt and pepper; 2 tsp. lemon juice; 1 small onion, thinly sliced; 1 (10 3/4 oz.) can condensed Cheddar cheese soup; 1 large tomato, sliced; dried oregano leaves to taste

Try this homemade Fish Casserole recipe the whole family will love. Made with clove garlic, margarine, frozen leaf spinach and haddock fillets. Easy ste…

This Fish Casserole relies on simple, everyday ingredients such as garlic, margarine or butter, haddock fillets and salt and pepper. It comes together quickly and makes 4 servings, at about 144 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

It's versatile enough for an easy weeknight dinner yet satisfying enough for guests at the weekend. Serve it with your favorite sides, and keep any leftovers for a quick meal the next day.

Updated Jun 30, 2026

Serves 4 Seafood

Tips for the best results

Read through all the steps once before you start and measure out your ingredients first — it makes everything go more smoothly.
Taste as you go and adjust the seasoning before serving.
Avoid overcrowding the pan — cook in batches if needed for the best texture.
Let the dish rest for a few minutes before serving so the flavors settle.
Store leftovers in an airtight container in the fridge and enjoy within a few days.

Variations & substitutions

Use a neutral oil or a plant-based spread in place of butter for a dairy-free version.

No specific allergen information. Please check the ingredient list for possible allergens.

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Fish Casserole

Tips for the best results

Variations & substitutions

My Personal Notes

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