Snow Skin Mooncake 香芋紫薯冰皮月饼 (Taro & Purple Sweet Potato)

Name: Snow Skin Mooncake 香芋紫薯冰皮月饼 (Taro & Purple Sweet Potato)
Prep time: 1 h 15 min
Cook time: 45 min
Total time: 2 h
Cuisine: Asian
Ingredients: 200 ml milk (I used lactose-free); 20 g Stevia sweetener (or castor sugar); 20 g unsalted butter (I used dairy-free); 50 g glutinous rice flour; 40 g rice flour; 25 g wheat flour; 5 g purple potato powder; 100 g purple sweet potato; 100 g taro; 20 g vegetable oil; 50 g Stevia sweetener (optional, season to taste); 100-150 ml water; 20 g glutinous rice flour (to make gao fen or cooked glutinous rice flour)