Preheat the oven to 180 °C.
Grease a rectangular or square casserole dish with oil spray.
Layer half of the sliced potatoes in the dish, and sprinkle them with half the contents of the sachet of KNORR Cheese and Bacon Flavour Potato Bake.
Heat the oil in a pan and fry the chicken cubes until golden brown. Sprinkle with the remaining KNORR Potato Bake powder. Place chicken cubes on top of the potatoes.
In the same pan, fry the onion, peppers, mushrooms and garlic until just soft.
Spread the vegetables on top of the chicken in the casserole dish. Top with the remaining potato slices, and pour the cream all over the top.
Bake at 180 °C for 1 hour, then sprinkle the cheese over the top and bake for a further 30 minutes.
Serve piping hot, with a green salad.