Ingredients
1 tablespoonolive oil
2-1/2 poundspotatoes (about 5 large), peeled and cut into 1/4-inch slices
3/4 teaspoonsalt
1/2 teaspoonblack pepper
2 large onions, chopped
1 poundasparagus, ends trimmed and cut into 1-inch pieces
4 tablespoonsunsalted butter
1/4 cupgrated Parmesan cheese
6 slices processed American cheese
Preparation
