Preheat your oven to 375°F (190°C).

In a large pot, boil the sliced potatoes until they are just tender. Drain and set aside.

In a skillet, sauté the chopped onion until translucent. Add the sliced smoked sausage and cook until lightly browned.

In a small bowl, mix together the sour cream, salt, and pepper.

Grease a baking dish and start layering the ingredients: start with a layer of potatoes, then add a layer of the sausage and onion mixture, followed by a drizzle of the sour cream mixture, and a sprinkle of grated cheese. Repeat until you've used up all the ingredients, finishing with a layer of cheese on top.

Bake in the preheated oven for about 30-40 minutes, or until the cheese is melted and bubbly.

Remove from the oven and let it cool slightly before serving. Garnish with a sprinkle of paprika for some extra flavor.

Enjoy!