Peel and cut the waxy potatoes into 1-inch cubes. Place them in a pot, cover with cold water, and add salt and bay leaves. Boil for about 20 minutes until tender.

During the potato cooking, heat butter or olive oil in a skillet. Sauté chopped shallots and minced garlic for 3-4 minutes until fragrant, then add kale and a splash of water. Cover and steam for 5-7 minutes.

Drain the potatoes, remove bay leaves, and mash with a potato masher. Stir in remaining butter, milk, salt, pepper, and nutmeg until smooth. Fold in the kale mixture.

Cook the smoked sausage by grilling, steaming, or sautéing until heated through and slightly browned, about 8-10 minutes.

Serve the mashed potato-kale mixture topped with slices of smoked sausage. Optionally drizzle with olive oil.