Wash and peel the potatoes.

Dice the potatoes into small cubes.

Boil the potatoes in salted water until tender.

Cook the bacon until crispy and chop it into small pieces.

Combine milk, mayonnaise, sour cream, butter, onion garlic salt, pepper, and cheddar cheese slices in a bowl.

Stir the mixture until the cheese melts and blends well.

Drain the boiled potatoes and add them to the cheese mixture.

Top the mixture with the prepared bacon pieces.

Sprinkle mozzarella cheese on top.