Melt a knob of butter (oil will do too)
Chop the onion quite finely
Fry in the butter on medium heat for about 5 minutes until it becomes clear
Meanwhile chop a courgette into small chunks
If using mushrooms, slice and add them with the courgettes
Fry for another 5-10 minutes until the courgette browns slightly
Tear up some leftover chicken into bit size strips. I always make this with leftovers from a roast.
Stir in the chicken. This doesn't need to cook so go straight to the next step
Measure out 1/2 a pint of milk (full fat or semi skimmed)
Add a level dessert spoon of cornflour and mix well.
Pour this into the pan and keep stirring....
It will thicken in a few seconds
Add a tsp of bouillon powder or 1/2 a stockcube, and 1 1/2 dessertspoons of soy sauce. Stir through.
Add a large handful of frozen peas
Simmer very low for 5 minutes to cook the peas.
Serve on rice with extra soy sauce on the side