Clean the cauliflower, cut into florets and blanch in salted water. Peel the potatoes, cut them into thick slices and pre-cook them in salted water for 10 minutes. Melt the butter, add the flour and add the milk. Season and cook for five minutes. Add the processed cheese in flakes and let it melt. Finally, add the ham to the sauce. Mix the cauliflower with the potatoes and place in a baking dish. Pour the sauce over it and sprinkle with cheese.
Bake in the oven at 180 ° C, fan oven 160 ° C for about 30 minutes. The cheese should have slightly brown tips.