Easy Fish Pie with Mashed Potato Top for Elderly Parents

Fish pie is one of those meals that feels both special and deeply comforting at the same time.

There's something about the creamy sauce, the tender fish and that fluffy mashed potato topping that just feels like proper home cooking. And for elderly parents, fish is one of the very best proteins you can serve - easy to digest, incredibly gentle on the system and absolutely packed with nutrients.

I'll be honest - this one takes a little more effort than some of the other recipes in this collection. But it's absolutely worth it. And once you've made it a few times it becomes second nature. The looks on Mum's face when I bring this one out makes every single step worthwhile.

Why This Recipe Works for Elderly Parents

• Exceptionally soft and easy to eat - fish flakes naturally into tender pieces and the creamy sauce keeps everything moist and easy to manage

• Excellent source of protein and omega-3s - fish is one of the most beneficial proteins for elderly health, supporting brain function, heart health and joint mobility

• Easy to digest - white fish is one of the gentlest proteins on the digestive system

• No tough textures - everything in this pie is soft, from the fish to the sauce to the mashed potato topping

• Feels like a treat - there's something about fish pie that feels special, which is lovely for elderly parents who deserve to feel cared for at mealtimes

Recipe Details

Serves: 6 Prep time: 25 minutes Cook time: 45 minutes Freeze: Up to 2 months

Ingredients

For the filling:

• 600g firm white fish fillets (cod, hake, barramundi or any firm white fish), cut into large chunks

• 200g cooked peeled prawns (optional but lovely)

• 300ml full cream milk

• 300ml thickened cream

• 1 bay leaf

• 50g butter

• 50g plain flour

• 1 cup frozen peas

• 2 tbsp fresh or frozen parsley, finely chopped

• Salt and white pepper to taste

• Pinch of nutmeg (optional - adds a lovely warmth)

For the mashed potato topping:

• 1kg potatoes, peeled and chopped

• 50g butter

• ¼ cup warm milk

• Salt and white pepper to taste

Method

Step 1 - Preheat your oven Preheat your oven to 180°C (160°C fan forced).

Step 2 - Poach the fish Place the fish chunks in a wide shallow pan. Pour over the milk and cream and add the bay leaf. Place over a gentle medium heat and poach the fish for 5–6 minutes until it just turns opaque and starts to flake. Do not boil - a gentle simmer is all you need. Using a slotted spoon, carefully remove the fish and set aside. Reserve every drop of the poaching liquid - this becomes your sauce and is full of flavour.

Step 3 - Make the sauce In a medium saucepan, melt the butter over medium heat. Add the flour and stir constantly with a wooden spoon for 1–2 minutes to cook out the raw flour taste - this forms what is called a roux. Gradually add the reserved poaching liquid a little at a time, whisking constantly after each addition to keep the sauce smooth and lump free. Continue until all the liquid is incorporated and you have a smooth, thick and glossy sauce. Add the parsley, season generously with salt and white pepper and add a pinch of nutmeg if using.

Step 4 - Assemble the filling Gently flake the poached fish into large pieces and arrange in the base of your baking dish or individual foil containers. Add the prawns if using. Pour the creamy sauce evenly over the top. Scatter over the frozen peas.

Step 5 - Make the mashed potato topping Boil the potatoes in well salted water until completely tender - about 15–20 minutes. Drain very thoroughly and return to the pot. Add the butter and warm milk and mash until very smooth, creamy and completely lump free. Season well with salt and white pepper. For elderly parents a very smooth mash is important - take the extra time to get it really silky.

Step 6 - Top and bake Spoon the mashed potato over the fish filling and spread evenly. Run a fork gently over the surface to create soft ridges. Bake in the preheated oven for 25–30 minutes until the top is golden and the filling is bubbling gently around the edges.

Step 7 - Rest and serve Allow to rest for 5 minutes before serving. This helps everything settle and makes it much easier to portion into neat servings.

Freezing Instructions

This recipe freezes best before baking:

1. Assemble the pie in individual foil containers - do not bake

2. Allow the filling to cool completely before adding the mashed potato topping

3. Add the mashed potato topping once the filling is cool

4. Cover tightly with foil lids or plastic wrap

5. Label with dish name and date

6. Freeze for up to 2 months

Note: Fish pie has a slightly shorter freezer life than meat-based dishes — 2 months is the recommended maximum for best quality and food safety.

To cook from frozen: Place covered foil container in a preheated 180°C oven for 55–60 minutes until piping hot throughout. Remove foil for the last 10 minutes to brown the potato topping.

To cook from thawed: Thaw overnight in the fridge. Bake at 180°C for 30–35 minutes until golden and piping hot throughout.

Always ensure food is piping hot all the way through before serving.

Kim's Tips

💕 Don't overcook the fish when poaching - it continues cooking in the oven so you only want it just cooked at the poaching stage. Overcooked fish becomes dry and loses its lovely flaky texture.

💕 White pepper instead of black - white pepper gives a gentler heat and keeps the sauce looking clean and creamy. It's worth keeping a small jar in the pantry specifically for cream sauces and fish dishes.

💕 Warm your milk before making the roux sauce - adding cold liquid to a hot roux can cause lumps. If your sauce does get lumpy, simply use a whisk rather than a wooden spoon and whisk vigorously - it will smooth out.

💕 Add extra vegetables if you like - finely diced leek or corn kernels work beautifully in this pie alongside the peas. Both are soft and easy to eat and add lovely flavour and nutrition.

💕 Prawns are optional but lovely - they add a little sweetness and variety to the filling. If your parent has a shellfish sensitivity simply leave them out — the pie is just as delicious without them.

💕 Individual portions make serving so much easier - rather than one large pie, assemble in individual foil containers from the start. Each person gets their own perfectly portioned pie and reheating is much more even.

What You'll Need

Individual foil baking containers are essential for this recipe if you're batch cooking. I've also linked a good quality whisk and my favourite stick blender for smooth sauces on my Amazon storefront.

👉 Shop my kitchen recommendations on Amazon

More Batch Cook Recipes

• ✅ Slow Cooker Chicken & Vegetable Soup

• ✅ Soft Beef & Potato Cottage Pie

• ✅ Creamy Pumpkin & Lentil Soup

• ✅ Easy Fish Pie with Mashed Potato Top (you are here)

• 🍚 One-Pan Chicken & Rice Casserole

• 🍝 Soft Pasta with Hidden Vegetable Sauce

• 🧁 Banana & Oat Breakfast Muffins

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