Step 1

Preheat oven to 400 degrees F (200 degrees C).

Step 2

Remove and wash outer leaves from cabbage; line a 13x9-inch baking dish with the leaves to cover the bottom entirely. Shred remaining cabbage.

Step 3

Mix shredded cabbage, potatoes, and smoked sausage in a bowl; spread atop the cabbage leaves in the baking dish.

Step 4

Whisk milk, eggs, salt, and pepper together in a bowl; add bread cubes. Set aside until bread absorbs some liquid, 1 to 2 minutes; pour over the cabbage mixture. Top with butter slices.

Step 5

Bake in preheated oven until the potatoes are tender and the top is lightly browned, about 45 minutes.