Tres Leches Cupcakes

Preheat oven to 325 degrees F (165 degrees C). Line 12 muffin cups with paper liners.

Beat eggs and 1/3 cup white sugar together in a bowl using an electric mixer until pale and fluffy; mix in milk and 1 dash vanilla extract. Whisk cake flour, baking powder, and salt together in a separate bowl; stir into egg mixture.

Beat egg whites and cream of tartar together in a separate bowl using an electric mixer until soft peaks form. Gradually add remaining sugar to egg whites mixture and beat until mixture is glossy and firm. Fold egg whites mixture into flour mixture until batter is just mixed. Spoon batter into the prepared muffin cups.