Cheese Potato Flatbread! No Oven, Golden and Crispy!

Ingredients:
- 120g bread flour
- 3g salt (1/2 tsp)
- 80ml milk
- 20g melted butter
- 500g potatoes
- 20g red bell pepper
- 20g onion
- Scallions
- Mozzarella cheese
- 3g salt (1/2 tsp)
- Black pepper
- 20g butter