Put glutinous rice flour, sugar, and salt in a bowl, then mix well with water.
After evenly mixing the batter, cover it with plastic wrap and cook in the microwave.
Take out the cooked dough and knead it with a spatula while cooling.
Pinch off a bite-sized amount of dough, add your desired filling, and shape it into a ball.
Coat the finished mochi with corn starch to complete.