You can't beat a nice bit of cheesy carby indulgence to make the belly very happy, and this delicious cheddar cheese and onion gnocchi gratin delivers it in spades and it is all topped by a crispy cheesy topping!
Cut the onions in half, peel them and then cut them int into very thin half-moon shapes.
Strip the leaves from the sprigs of thyme.
Heat a 25cm or 10" frying pan over a low/medium heat and add the butter for the onions and the thyme leaves. When the butter has melted, add the onions, partially cover with a lid and cook them for 30-35 minutes.
You want the onions to soften completely and become a little golden, but not deeply caramelised.
Grate all of the cheese, separating it as per the instruction list
Melt the butter for the sauce in a 17cm or 7" saucepan over medium heat, and when it has melted, add the flour, cooking for 3-4 minutes, stirring constantly.If the roux begins to colour, reduce the heat.
Begin this process around 10 minutes before the onions are cooked.Now is also a good time to bring a 20cm or 8" saucepan of water to a boil.
Pour the milk little by little into the pan until you have a smooth and silky bechamel sauce.
Reduce the heat under the sauce and add the white pepper, nutmeg and cheese. Stir constantly until you have a smooth sauce.
Adding the cheese a handful at a time makes this process easier.
By now the water for the gnocchi should be boiling, add a generous amount of salt (around ½-¾ tsp), and cook until the gnocchi begins to float. (2-3 minutes) then drain.
Combine the softened onions, cheese sauce and gnocchi and transfer it to a baking dish.
Mix together the remaining cheddar cheese with the breadcrumbs and sprinkle it over the gnocchi.
Transfer to the oven and bake for 15 minutes at 200°C or 390°F, then slide under the grill for 3-5 minutes to crisp up, and serve.
It helps to allow the dish to cool for 5-10 minutes before serving.