oven to 375°F (190°C). Lightly grease a medium ceramic baking dish (about 2 to 2 1/2 quarts) with the softened butter, coating the bottom and sides so the potatoes don’t stick.
Scrub the russet potatoes well and pat them dry. Leave the skins on for a rustic texture, or peel them if you prefer. Slice the potatoes into thin rounds, about 1/8–1/4 inch thick, aiming for even thickness so they cook at the same rate.
