Ingredients
Method
- Preheat oven to 350°F. Grease a 4-inch round pan and line bottom with parchment.
- Whisk flour, baking powder, and salt. Beat egg with sugar until pale. Fold in melted butter, milk, vanilla, then dry mix.
- Bake 16–18 minutes. Cool fully before frosting.
- Make Swiss meringue: heat egg white and sugar over simmering water to 140°F, whisk until sugar dissolves. Whip to stiff peaks, then add butter, beat until silky. Add vanilla and one tiny drop blue gel. Frost chilled cake with a thin smooth coat.