Cheesy Scalloped Sliced Potato Bake

Idaho potato slices 52.5% , modified corn starch 23.8% , cheddar 11.9% , maltodextrin 5.9% , vegetable oil 3.0% , skimmed milk 1.5% , salt 0.4% , dehydrated onion 0.4% , buttermilk powder 0.4% , E508 0.2% , autolyzed yeast extract 0.1% , natural flavouring 0.1% , E500ii 0.0% , sunflower lecithin 0.0% , E415 0.0% , sugar 0.0% , parsley 0.0% , E160c 0.0% , E160b 0.0% , freshness preserved by sodium bisulfite 0.0%