01 - Fill steamer with water and bring to a simmer. Line cupcake molds or silicone cups with paper liners.
02 - Whisk together flour, baking powder, baking soda, and salt in a bowl until well blended.
03 - Beat eggs and sugar in a large bowl until pale and thick. Add milk, melted butter, and vanilla extract. Mix thoroughly.
04 - Gradually fold dry ingredients into wet mixture until just combined. Avoid overmixing to maintain texture.
05 - For blooming colors, divide batter and fold in desired food coloring. Pour batters in layers or swirl for marbled effect.
06 - Spoon batter into prepared cupcake molds, filling each about ¾ full to allow for rising.
07 - Place molds in steamer with adequate space for steam circulation. Cover lid with clean cloth to prevent condensation dripping.
08 - Steam over medium heat for 12–15 minutes until toothpick inserted comes out clean and tops have bloomed or cracked open.
09 - Remove from heat and let cool slightly. Decorate with sprinkles, edible flowers, or chocolate chips as desired.