This Taro Mille Crepe Cake is very beautiful and tasty, but it is time-consuming to make. Even if you are a master at making crepes, you have to make a lot of them so it will take up a good chunk of time. The taro flavor comes from taro bubble tea powder which you can buy at most Asian markets.
Add the flour, salt, taro powder, milk, eggs, and melted butter to a blender cup. Blend on medium-high speed until smooth, about 1 minute. Leave the lid on and allow it to rest for at least one hour and up to overnight in the fridge.
Heat a 10-inch non-stick pan over medium-high heat. Use a paper towel to wipe the bottom with a bit of oil (or butter). Pour ⅓ cup of batter into the pan, pick it up, and immediately swirl it in a circle to cover the pan in a thin layer. Cook the crepe for about 1 minute until the bottom begins to brown. Use a spatula to flip it over and cook briefly on the other side, then transfer it to a plate.
Repeat until the remaining batter is cooked. You should end up with around 15-18 crepes. Allow the crepes to cool in the refrigerator until cool to the touch.
Taro Cream
Add the heavy cream, taro powder, and powdered sugar to a mixing bowl and beat on high for 3-4 minutes until stiff peaks form.
Assemble
To assemble the cake, place one crepe on a large plate or cake stand. Put a small amount of cream in the center, then use an offset or icing spatula to spread it evenly across the crepe. Repeat these layers 15 times. Refrigerate for at least 1 hour, then slice and serve!