In a microwave-safe bowl, combine 1 cup of glutinous rice flour with a quarter cup of sugar. Gradually whisk in half a cup of water until the mixture is smooth and free of lumps.

Cover the bowl with a wet paper towel and microwave on high for 1 minute. Stir gently and repeat two more times until the dough thickens and becomes slightly translucent.

Remove the bowl from the microwave and allow the mochi dough to cool for 5-10 minutes.

Dust your work surface with cornstarch and transfer the cooled mochi dough onto it. Dust the top with more cornstarch and divide into eight equal pieces.

Take one piece of mochi, flatten it in your palm, place a chunk of banana in the center, fold edges over to seal, and roll into a ball.

Chill mochi in the refrigerator for about an hour before serving for enhanced flavors and texture.