Mix together 150g milk, 1/3 cup granulated sugar, 2 tablespoons vegetable oil, and 1 large egg. Set bowl aside.
Mix together 150g glutinious rice flour with 115g of tapioca starch, 1 3/4 teaspoons of baking powder, and 1/2 teaspoon of table salt. See Note 1.
Add the wet ingredients into the dry ingredients and use a spoon to mix together. At first the dough will seem very wet, but if you let it sit for a minute it will thicken up to a pipeable consistency.
Put dough into a piping bag fitted with a large hole tip.
Heat vegetable oil for frying in a saucepan or Dutch oven, should be at least 2” deep, until it reaches 350F.
While oil is heating up, cut out 8 parchment paper squares approximately 5 inches by 5 inches (one for each donut). It also helps to trace a cirlce about 3" in diameter on a piece of paper and use this as a guide underneath the parchment squares when piping the donuts.
Place your circle guide under the parchment paper and pipe a dough ball on to the circle in the 6'oclock position. Pipe another ball directly across from the first one in the 12'oclock position, then the 3'oclock, and the the 9'oclock position. Now fill in between the balls with one more dough ball so you have a total of 8 dough balls around the circumference of the circle and they are each touching their neighbors. See Note 5.