Mix the coconut milk, milk, and sugar until the sugar dissolves. Add both flours and baking powder, then mix well with a whisk or spatula until smooth.

If using whole grain rice flour, the batter may be a bit dry, so add an extra 4 teaspoons (20 ml) of milk. If using regular rice flour and the batter is already the right consistency, you don't need to add more milk. Lightly grease the molds with oil, fill them with batter, and place them in a steamer basket.

Bring water to a boil, then place the steamer basket over the pot and steam for 20 minutes.

After 20 minutes, remove the cakes and let them cool before serving.