A professional pastry chef shares a recipe for delicious sweet potato treats that can be made in a toaster oven without using a regular oven. Cut the sweet potatoes into small pieces so they cook easily, remove the bitterness, and then heat them in the microwave. Mash them with a potato masher, then add butter, flavorful brown sugar (light brown sugar or maple sugar is also recommended), egg yolk, vanilla extract, and heavy cream and mix well. Adjust the amount of heavy cream to achieve a moist and rich texture, then shape into cubes. Decorate the surface with the remaining egg yolk and black sesame seeds, and bake in a toaster oven until done. Perfect for an autumn snack or a home café treat, these smooth and gently sweet sweet potatoes are a treat that can be enjoyed by children and adults alike.