Crispy Potatoes Au Gratin

from Aunt Patti: All of the following ingredients are estimates

• extra virgin olive oil (to grease 9x13 baking dish -- or for smaller portions use GLASS pie plate)
• 3 - 6 potatoes, VERY thinly sliced (I usually use red potatoes but Idahos are good too - clean well but don't peel)
• salt (little)
• 2 T (or less) of melted butter
• shredded cheddar (at least 4 oz), I use more
• bread crumbs (no more than 1/2 cup or they will be dry)

Preheat oven to 425. Lightly salt potatoes and arrange in even layer. Drizzle melted butter and sprinkle with cheese and bread crumbs. 20 minutes and voila! OR, if you can't use a 425 oven, you can put in @ 350 for 30 minutes or so. But they're crunchier (better) at higher heat.