In a mixing bowl, combine glutinous rice flour, cornstarch, and granulated sugar. Gradually add milk while stirring, creating a smooth batter without lumps.

Pour the prepared batter into a heatproof dish and cover it. Steam the batter over high heat for 20 minutes until firm and translucent.

Carefully remove the dough from the steamer and let cool slightly. Knead in oil or melted butter and dragon fruit juice until smooth.

Dust hands with cornstarch or coconut flakes, pinch off pieces of dough, flatten, and place a slice of banana in the center, folding the edges over to seal.

Roll each mochi ball in coconut flakes for an even coat and place on a plate while shaping the others.

Once all pieces are coated, display on a platter and optionally dust with powdered sugar or drizzle with chocolate before serving.