In a mixing bowl, combine the sweet rice flour and sugar.

Gradually stir in the water until the mixture is smooth.

Cover the bowl with plastic wrap, leaving a small vent for steam.

Microwave on high for 1 minute, stir, and repeat for another minute until the mixture is translucent.

Carefully remove the bowl from the microwave and let it cool for a few minutes.

Dust a clean surface with cornstarch to prevent sticking.

Transfer the dough to the dusted surface and knead gently.

Divide the dough into equal portions and shape each piece into a small ball.

Flatten each ball and place a small spoonful of your chosen filling in the center.

Fold the edges over the filling and pinch to seal.

Place the filled mochi on a plate dusted with cornstarch.

Refrigerate for about 30 minutes to set the shape and enhance the flavor.