Boil the sweet potatoes and cut the onion and bacon into appropriate sizes.

Peel the sweet potatoes and mash them with a fork while hot, adding a small amount of butter and 1 tbsp of syrup or oligosaccharide.

Mix the mashed sweet potatoes thoroughly.

Heat a pan with a small amount of butter and sauté the onions until they become translucent.

Add the bacon to the pan, sprinkle with a pinch of pepper, and sauté well.

Spread the mashed sweet potatoes in an oven-safe dish.

Layer the sautéed bacon and onions on top of the mashed sweet potatoes.

Top with a generous amount of mozzarella cheese.