Peel and thinly slice the ... proscuitto or slab bacon) into 1/4" dice. Spray an ovenproof casserole dish with non-stick spray or ... sliced onions. Layer potato slices over the onions. Add ... 250°F for 3 hours.
Preheat oven to 350°F and ... onion, 1/2 the bacon and 1/2 the cheese; repeat ... Pour evenly over potato mixture and bake, covered, for ... 5 to 10 minutes.