Let boiled water rest for 15 minutes before using. Do not use boiling hot water.
In a bowl, combine glutinous rice flour, rice flour, sugar, and salt. Mix well.
Add mashed sweet potato and mix evenly.
Add cooking oil and mix again.
Slowly pour in hot water while mixing until a soft dough forms.
Cover the dough and let it rest for 15 minutes.
Divide dough into 1 tbsp portions and roll into balls.
Flatten each piece, add cheese filling, then seal and roll again.
Lightly wet hands with water, then roll balls in sesame seeds to coat evenly.
Fry in medium-low heat until golden brown and crispy. Drain and serve.