In a large bowl, combine the glutinous rice flour, all-purpose flour, sugar, baking powder, and salt.
Add the lukewarm water and vanilla extract, then mix until you have a smooth, soft dough.
Cover the dough and let it rest for 15 minutes.
Divide the dough into 6 equal portions, then flatten them by hand.
Place a spoonful of adzuki bean paste in the center of each, then shape them into balls, making sure the filling is completely sealed.
Heat the oil in a deep skillet to approximately 340°F (170°C).
Fry the doughnuts for 2-3 minutes per side, until golden brown, then place them on a paper towel-lined plate to absorb the excess oil.
While still warm, sprinkle with powdered sugar and serve.
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