Preheat oven to 375 degree F.
Cream the butter and sugar. Add the black sesame powder, egg, and vanilla paste. Mix until combined.
In a separate bowl, whisk together the salt, baking powder and all-purpose flour. Alternate adding flour mixture and milk on low-med speed. Repeat. Beat on med-high for 1 minute until fully combined.
Divide batter between 12 prepared muffin tins. Bake for 15-18 minute until skewer comes out clean when inserted in the center. Remove cupcakes from tin and let cool on rack. Begin preparing frosting. Once cupcakes are cool. Use apple corer/melon baller/fat end of piping tip to create a shallow cavity on top of cupcake.