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Preheat the oven to 390F / 200C.
Melt the butter in a large frying pan or saucepan, then cook the onions slowly for about 10 minutes or until soft and beginning to caramelize.
Add the mushrooms to the onions in the pan and cook for a further couple of minutes.
Grease a standard quiche dish (or other round pan) with a little butter, then spread the onions and mushrooms evenly over the bottom. Scatter over the chopped ham and cheese.
Slowly add the milk to the flour in a large jug. Whisk continuously so that there are no lumps, then whisk in the eggs, mustard, and salt and pepper.
Pour the egg mixture over the fillings in the dish/pan, then bake for 30 (to minutes or until the mixture is just cooked in the centre. Slice and serve!