Potato, Onion Gratin with Chicken Broth – Easy Comfort Food for One

There’s something deeply satisfying about turning a simple homemade chicken broth into a proper meal. This potato and onion gratin is my go-to when I fancy real comfort food but don’t want the heaviness of cream. It’s rustic, full of flavour, and perfect when you’re cooking for one. With a bit of garlic, buttery fried onions, and parboiled potatoes layered together, it transforms your leftover broth into a golden, bubbling dish that smells as good as it tastes.

Homemade Chicken Broth – The Secret Ingredient

This potato onion gratin starts with proper stock. I used the carcass of a free-range chicken, simmered gently with onion, carrot, bay leaves, and black peppercorns until the carrots were soft. The key here is patience.
Chicken broth should never be boiled – it clouds the liquid and dulls the flavour. Keep it at a gentle simmer for two to three hours, skimming off any foam now and then. This slow cooking draws out all the goodness and gives you a clear, golden broth packed with rich, savoury depth.

Once you’ve strained it, you’ve got the base for countless dishes – soups, risottos, sauces – or, in this case, a creamy-tasting potato gratin without cream.

Potato, Onion & Garlic Gratin with Chicken Broth (Serves 1)

Ingredients

250–300 g parboiled potatoes, sliced

½ large onion, thinly sliced and fried until soft and golden

1 small clove garlic, finely chopped or crushed

150–200 ml hot chicken broth (just enough to moisten the layers, not drown them)

Small knob of butter or a drizzle of olive oil

Salt and freshly ground black pepper

Optional: a pinch of thyme or rosemary, or a scattering of grated cheese for the topping

Method

Preheat the oven to 190°C (fan 170°C).

Grease a small ovenproof dish with butter or oil.

Layer the potatoes and onions:

Start with a layer of potato slices, seasoning lightly.

Add some of the fried onions and chopped garlic.

Repeat until everything’s used, finishing with potatoes on top.

Pour over the hot chicken broth until it reaches halfway up the layers.

Dot with butter or drizzle olive oil across the surface.

Cover with foil and bake for 15–20 minutes until the broth has mostly absorbed and the potatoes are tender.

Remove foil and bake another 10 minutes to crisp and brown the top.

Optional: add grated cheese before the final bake for a golden crust.

Why Parboiled Potatoes and Fried Onions Work So Well

Using parboiled potatoes guarantees even cooking and that lovely creamy texture between the layers. Because they’re partly cooked, they soak up the broth beautifully and save time in the oven — perfect when you’re only cooking for one.

Fried onions, meanwhile, bring sweetness and depth. Slowly cooking them first removes any raw harshness and adds a golden, caramelised flavour that makes this easy gratin recipe taste like something far more indulgent.

Add garlic, and suddenly those humble ingredients become irresistible. The aroma alone is enough to make you hover near the oven.

A Few Flexible Chef Tips

Make it a meal: Add a little shredded cooked chicken to the layers for extra protein.

Add greens: A handful of spinach or kale wilts nicely into the broth.

Go crispy: Finish under the grill for a few minutes for an even crisper top.

Store leftovers: Cool and refrigerate — it reheats beautifully the next day.

Potato onion gratin - Comfort Food, Simplified

This potato and onion gratin with chicken broth is proof that you don’t need cream or complicated sauces to create comfort food. It’s golden on top, soft underneath, and bursting with the savoury warmth of homemade chicken broth.

Simple, frugal, and deeply satisfying — the kind of dish that reminds you why home cooking is always worth the effort.

This recipe is part of the Potato Recipes — The Flexible Chef's Complete Collection — a complete collection of potato recipes from The Flexible Chef. Explore the full collection.
This potato gratin recipe is also featured in my French Recipes, a collection of French recipes from a former Limousin restaurateur — confit, braises, fish, gratins, and van life French cooking from Casa Adora and the road.
Find more recipes and food adventures here.
Wonky photos, proper food, genuine adventures — The Flexible Chef