Preheat your oven to 350°F (175°C) and line a mini cupcake pan with liners.
In a large bowl, cream together the softened butter and sugar until light and fluffy.
Add the eggs one at a time, mixing well after each addition.
Stir in the vanilla extract.
In a separate bowl, whisk together the flour, baking powder, and salt.
Gradually add the dry ingredients to the wet ingredients, alternating with the milk.
Mix until just combined, being careful not to overmix.
Fill each mini cupcake liner about two-thirds full with batter.
Bake in the preheated oven for 12-15 minutes, or until a toothpick comes out clean.
Let them cool completely before frosting and decorating.