Sausage and Potato Gratin

Boil the potatoes, peel them, and slice them into rounds.

Slice the smoked sausage into rounds.

Slice the onion into rounds.

In a saucepan, add the oil and sauté the onion.

Add the smoked sausage and sauté for a few minutes.

In a separate saucepan, melt the butter.

Add the all-purpose flour and mix well.

Gradually add the milk, whisking constantly to prevent lumps.

Add the cream cheese and heavy cream and mix until a smooth sauce is achieved.

In a baking dish, layer some white sauce followed by a layer of sliced potatoes.

Add the sautéed onion and smoked sausage.

Cover with the remaining white sauce.

Top with the slices of mozzarella.

Bake in a preheated oven for 4 minutes or until golden brown.