In a medium mixing bowl, whisk together the glutinous rice flour, granulated sugar, baking powder, and vanilla extract until well combined.

In a separate bowl, crack the eggs and add the milk and melted butter. Mix thoroughly until smooth and sticky.

Slowly incorporate the wet mixture into the dry ingredients, stirring gently. Allow the dough to rest for 5 minutes.

Moisten your hands and roll a portion of the dough into a ball. Flatten each ball slightly and shape into a doughnut ring.

Heat oil in a deep skillet or pot to 350°F. Fry the doughnuts for about 3-4 minutes per side until golden brown.

Remove the doughnuts and cool on a wire rack for 10 minutes. Prepare the glaze by mixing powdered sugar with your chosen flavoring.

Dip each doughnut into the glaze, allowing it to coat the chewy surface. Customize with additional flavorings.

Serve the doughnuts on a platter, garnished with a sprinkle of powdered sugar or flavorings.