1. Wrap the sweet potatoes with paper towels, sprinkle some water, put them in the microwave oven, and high heat for 10 minutes.
2. Cut in half from the middle and hollow out the yellow heart.
3. Add butter, white sugar, and milk and mix well.
4. Put it back in the sweet potato.
5. Sprinkle with shredded cheese and spread cheese slices.
6. Brush the egg yolk again, oven 160 degrees, 10 minutes.
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