Layer 3 potatoes, 1 sweet potato, 1 zucchini, 1/4 small butternut pumpkin (all peeled and sliced 5mm thick) in a casserole dish with grated cheese and onion slices (1 small onion) sprinkled through middle layers. Pour in 1/4 cup chicken or veggie stock, put on lid or aluminium foil and bake at 180 degrees celcius for 50 minutes. Take out and pour 1/2 tub cream (very optional I'd say!) over top and sprinkle more cheese if you like. Bake uncovered for a further 20 minutes.