Quick & Easy Fish Gratin: A Creamy, Cheesy Delight

Fish gratin is a classic comfort dish that brings together delicate fish, a rich and creamy sauce, and a golden, crispy topping. This quick fish gratin recipe is perfect for busy weeknights, taking just under 40 minutes to prepare. 

It’s packed with flavor and nutrients, making it a wholesome choice for the entire family. Whether you’re a seafood lover or just looking for a way to prepare fish differently, this gratin is a winner!

Why You'll Love This Recipe

• Quick and easy – Ready in under 40 minutes.

• Creamy and cheesy – A delicious combination of flavors.

• Healthy and nutritious – Packed with protein and Omega-3s.

• Family-friendly – A perfect meal for all ages.

Ingredients

For the Fish Gratin:

• 500g (1 lb) white fish fillets (cod, haddock, or tilapia), cut into bite-sized pieces

• 2 tbsp butter

• 1 small onion, finely chopped

• 2 cloves garlic, minced

• 1 cup (240 ml) heavy cream

• 1/2 cup (120 ml) milk

• 1 tbsp Dijon mustard

• 1 tsp lemon juice

• 1/2 tsp salt

• 1/4 tsp black pepper

• 1/4 tsp nutmeg (optional)

• 1/2 cup (50g) grated cheese (cheddar, Gruyère, or Parmesan)

• 2 tbsp chopped fresh parsley

For the Topping:

• 1/2 cup (50g) breadcrumbs (panko or regular)

• 2 tbsp melted butter

• 1/4 cup (25g) grated cheese

• 1 tbsp chopped parsley (for garnish)

Instructions

Step 1: Preheat the Oven

Preheat your oven to 375°F (190°C). Grease a baking dish lightly with butter or cooking spray.

Step 2: Prepare the Fish

Pat the fish dry with a paper towel and cut it into bite-sized pieces. Place them evenly in the greased baking dish.

Step 3: Cook the Sauce

1. In a medium saucepan, melt butter over medium heat.

2. Add the chopped onion and cook for 2-3 minutes until softened.

3. Stir in the minced garlic and cook for another minute.

4. Pour in the heavy cream and milk, then stir in the Dijon mustard, lemon juice, salt, pepper, and nutmeg.

5. Let the sauce simmer for 3-4 minutes until slightly thickened.

6. Stir in half of the grated cheese and let it melt into the sauce.

Step 4: Assemble the Gratin

1. Pour the creamy sauce evenly over the fish pieces in the baking dish.

2. In a small bowl, mix breadcrumbs, melted butter, and the remaining cheese.

3. Sprinkle the breadcrumb mixture evenly over the fish.

Step 5: Bake to Perfection

Bake in the preheated oven for 20-25 minutes until the topping is golden brown and the sauce is bubbling.

Step 6: Garnish and Serve

Sprinkle chopped parsley on top for freshness. Serve hot with a side of steamed vegetables, rice, or a fresh salad.

Tips for the Best Fish Gratin

• Choose fresh fish – Fresh or high-quality frozen fish works best.

• Don’t overcook – Overbaking can make the fish dry; remove it from the oven when the top is golden brown.

• Enhance the flavor – Add a pinch of cayenne pepper or paprika for a slight kick.

• Use different cheeses – Experiment with cheeses like mozzarella, feta, or blue cheese for a unique twist.

Frequently Asked Questions (FAQs)

1. Can I use frozen fish for this recipe?

Yes, you can use frozen fish, but make sure to thaw it completely and pat it dry before using it to prevent excess moisture in the dish.

2. Can I prepare this in advance?

Yes! You can prepare the dish up to the baking stage, cover it, and refrigerate it for up to 24 hours. When ready to bake, let it sit at room temperature for 10-15 minutes before placing it in the oven.

3. What side dishes go well with fish gratin?

Fish gratin pairs well with steamed vegetables, a light green salad, mashed potatoes, or garlic bread.

4. Can I make this dish gluten-free?

Absolutely! Substitute regular breadcrumbs with gluten-free breadcrumbs or crushed almonds for a crunchy topping.

5. Can I use salmon instead of white fish?

Yes! Salmon adds a rich, buttery flavor to the gratin and works just as well as white fish.

6. How do I store leftovers?

Store leftovers in an airtight container in the refrigerator for up to 2 days. Reheat in the oven at 350°F (175°C) for about 10 minutes or until warmed through.

7. Can I freeze fish gratin?

It’s best enjoyed fresh, but you can freeze it before baking. Assemble the gratin, cover it tightly, and freeze for up to 1 month. When ready to eat, bake directly from frozen at 375°F (190°C) for 35-40 minutes.

Final Thoughts

This quick and easy fish gratin is a comforting dish that combines creamy, cheesy goodness with the delicate taste of fish. It’s a fantastic meal for any occasion—whether it’s a busy weeknight dinner or a special family gathering. Give this recipe a try and let us know how you liked it!