This is a recipe for sweet potato mochi that can be easily made with just four ingredients and a microwave. It can be made without eggs, butter, or wheat flour, making it a good choice for people with allergies. Peel the sweet potato, cut it into 1cm slices, and soak it in water to remove bitterness. Then, heat it in the microwave until soft. Mash it finely with a fork, add milk and potato starch, and mix until smooth. Wrap the dough in plastic wrap and shape it into a log. Heat it in the microwave again and let it cool slightly. Cut it into your desired thickness, sprinkle with kinako (roasted soybean flour), and it's ready! The moist and chewy texture, the gentle sweetness of the sweet potato, and the fragrant flavor of the kinako are a perfect match. Tips such as turning it over halfway through heating to prevent uneven heating are also included.