Preheat your oven to 425°F (220°C) and line a baking sheet with parchment paper.

In a large bowl, combine glutinous rice flour, 1 cup of cold water, the neutral oil, baking powder, and granulated sugar. Stir until thick and mashed potato-like.

Gradually mix in remaining cold water if the batter is too dry, aiming for a smooth, slightly sticky dough.

Divide the batter in half; in one half, mix in yellow food coloring gel and diced mangos.

Drop heaping spoonfuls of both batters onto the lined baking sheet, spaced two inches apart.

Bake for 13-14 minutes until golden edges form and the tops are crisp.

Cool on a wire rack completely before serving.