Purple Potato Cake。紫薯大米發糕的詳細做法，鬆軟香甜，個個開花！

紫薯大米發糕的詳細做法，鬆軟香甜，個個開花！
主要食材：溫水100克，酵母粉3克，白糖20克，麵粉70克，粘米粉300克，清水450克，紫薯粉20克，白糖40克，黃油或者植物油20克，無鋁泡打粉5克。
Main ingredients: 100g warm water, 3g yeast powder, 20g white sugar, 70g flour, 300g rice flour, 450g water, 20g purple potato powder, 40g white sugar, 20g butter or vegetable oil, 5g aluminum free baking powder.