Here's a recipe for a moist sweet potato cake that can be easily made without an oven, using a toaster and pancake mix. Cut the unpeeled sweet potatoes into 1cm cubes and heat them in the microwave with sugar and water until soft. Mix melted butter, sugar, egg, and water, then add the pancake mix and mix until no dry flour remains. Add half of the heated sweet potatoes and mix. Pour the batter into a heatproof container, decorate with the remaining sweet potatoes on top, and bake in a toaster. Once browned, cover with aluminum foil to prevent burning, and you'll have a moist and fragrant cake. It's also delicious with honey or black sesame seeds, and is a perfect treat to enjoy the flavors of autumn.