Melt 1 tbsp of butter in a heated hot pot.

Sauté the chopped onion until fragrant.

Add ham or sausage and stir-fry until lightly browned.

Add 1 cup of kimchi and stir-fry until softened.

Add 3 slices of cheese and stir until melted and combined.

Add the boiled sweet potato and mix well.

Tear the bread into large pieces and add to the pot. Stir to combine.

Add 1/2 cup of tomato sauce and stir to coat the bread.

Cover the mixture with torn bread pieces.

Spread 2 tbsp of tomato sauce on top of the bread layer.

Top with a generous amount of mozzarella cheese, cover, and cook on low heat until the cheese melts.