Put the A ingredients into a plastic bag. There is no need to deflate the air from the bag. Shake well to mix.
Add the B ingredients to the mixed dry ingredients from Step 1 and shake again to mix. It will gradually come together to form a dough (do not knead the mixture).
Make into a log, and slice into cookies. Bake in the oven at 180℃ for 15-20 minutes.
Story Behind this Recipe
I had a lot of steamed sweet potatoes left over and decided to make cookies out of them. Though I didn't intend it, they ended up having pretty much the same texture as sweet potatoes.
Mixing everything in a plastic bag makes this so easy It's important not to deflate the air from the bag when mixing in the B ingredients, or else the dough will not come together. If you're having problems, add milk a teaspoon at a time until it comes together.