Sauerkraut Casserole

Drain the sauerkraut and slice the smoked sausage and cooked potatoes into bite-size pieces.

Cook onion in butter until sweet, then stir in caraway and mustard to season the base.

Fold sauerkraut, sausage, potatoes, and sour cream together until evenly coated.

Transfer to a baking dish and cover with buttered rye breadcrumbs.

Bake until bubbling at the edges and browned on top, then rest briefly before serving.