Crispy Taiyaki

Bahan-bahan (4 porsi)

• 1 cup cake flour
• ⅔ cup milk ((I used lactose-free 2% reduced fat milk, but you can also use whole or nonfat; use plant-based milk for vegan))
• 1 tsp baking powder
• 1 Tbsp sugar
• sweet red bean paste (anko)