There is no perfect substitute for glutinous rice flour (also called sweet rice flour or sometimes sticky rice flour). However, you can make your own using short grained glutinous white rice. You will need a high-powered blender, spice grinder or food processor to pulverize the dry raw glutinous white rice into a fine powdered flour. It is best to do this process a little bit at a time to allow the blades to move freely. Alternatively, but not quite the same chewy and sticky texture of glutinous rice flour, is to substitute Tapioca flour in a 1:1 ratio in the recipe. Tapioca flour is chewy but can take on a translucent color like in boba balls or tapioca pearls for our Homemade Cream Earl Grey Bubble Tea. Another option is to buy pre-made frozen glutinous rice balls in an Asian market.