Preheat the oven to 350 degrees and line a 12 count muffin tin with cupcake liners.
Combine the softened butter, eggs, sugar, and vanilla extract. Mix well.
Add flour, baking powder, and milk, and stir until well combined.
Bake for 18-20 or until a toothpick inserted into the center of the cake comes out clean. Allow to cool completely.