Naturally sweet sweet potato fa gao blooms into a golden prosperity cake. A family dessert with vibrant color and festive significance.
Combine the cooled, mashed sweet potato with sugar and vanilla extract in a large mixing bowl until smooth.
In a separate bowl, whisk all-purpose flour, rice flour, and baking powder together for even leavening.
Gradually add the dry mixture to the sweet potato blend, alternating with milk, stirring until a thick, pourable batter forms with no lumps.
Stir in vegetable oil until fully incorporated, then cover and let the batter rest for 20 minutes to activate the baking powder.
Fill muffin cups or ramekins ¾ full with the batter. Steam over simmering water on medium-high heat for 18–20 minutes, ensuring the lid is covered with a kitchen towel to prevent condensation from dripping.
Check doneness with a toothpick; the fa gao should have split tops and a fluffy interior. Cool slightly before serving.