01 -
Preheat the oven to 375°F (190°C). Lightly grease a 2 to 2.5-quart ceramic baking dish with the softened butter, coating the bottom and sides to prevent sticking.
02 -
Scrub russet potatoes thoroughly and pat dry. Leave skins on or peel, based on preference. Slice potatoes evenly into 1/8–1/4 inch thick rounds to ensure uniform cooking.
03 -
Arrange the sliced potatoes evenly in the greased baking dish, slightly overlapping like shingles. Lightly season with kosher salt and black pepper if using.
04 -
Stir the baked beans in their cans to loosen the sauce, then evenly pour them over the layered potatoes, spreading gently to cover most of the surface.
05 -
Cover the baking dish tightly with aluminum foil. Place it on the middle oven rack and bake for 45 to 55 minutes, until potatoes are tender and beans are bubbling at the edges.
06 -
Carefully remove the foil, watch for steam. Sprinkle shredded cheddar cheese evenly atop the hot casserole. Return uncovered to the oven and bake for an additional 10 to 15 minutes until cheese is melted and lightly browned.
07 -
Remove from the oven and let rest for 5 to 10 minutes to allow the sauce to thicken slightly. Serve warm directly from the baking dish.