Parmesan Roasted Potatoes

1/2 cup finely grated parmesan (1 1/2 ounces)
1/2 cup all-purpose flour
1 teaspoon salt
1/4 teaspoon black pepper
8 large boiling potatoes (3 1/2 pounds), peeled and quartered lengthwise
1 stick (1/2 cup) unsalted butter, melted

Preheat oven to 350°F.Sprinkle cheese on wax paper or foil and dry 1 hour. Transfer to a large sealable bag with flour, salt, and pepper, then shake to mix.

Rinse potatoes and drain in a colander. Add potatoes to flour mixture, tightly sealing bag, and shake to coat well.

Pour butter into a large shallow baking pan. Lift potatoes from bag and arrange in 1 layer in butter.

Roast in middle or lower third of oven, turning twice, until browned and crisp, about 1 1/4 hours.