1. After the butter, brown sugar and granulated sugar melt in water, stir well
2. Add egg yolk and stir well
3. Add flour and mix well
4. Add baking special high-temperature chocolate beans and stir evenly (or choose high-purity chocolate)
5. Brush the inner wall of the cup with a layer of butter for final demoulding. Start the dough from the bottom of the cup and stick it to the inner wall of the cup little by little. The dough should be more compacted, with the help of a rolling pin.
6. Preheat the oven at 180° and bake for 20 minutes
7. Melt ordinary chocolate
8. Brush the chocolate evenly on the inner wall of the cup with a brush
9. Put it in the refrigerator and refrigerate until the chocolate is completely solidified, and then pour in the milk.
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