In a microwave safe bowl, combine glutinous rice flour and sugar.
Add water and mix until there are no more lumps.
Cover the bowl loosely with cling wrap and microwave on the highest setting for one minute.
Depending on the microwave, you might need to do this in 3-4 blasts. Mix well with a wet spatula in between blasts.
Cook until the mixture has become translucent.
Dust a parchment paper very generously with corn or potato starch.
Turn out the cooked mochi mixture onto the parchment paper and let cool for 2 minutes.
Dust more starch onto the mochi mixture and flatten it to around 1 cm thickness (using a heavily dusted rolling pin will help to get an even thickness).
Cut out the mochis into 12 pieces. Dust off the excess starch of the surface of the mochis with a pastry brush (or pick them up one by one and gently clap a couple of times to dust off excess).
Fill the mochis with about one heaping teaspoon of filling.
Gather the ends of the mochi towards the middle and pinch to seal everything.
Turn it upside down.
Enjoy! ;)