Beat butter with an electric mixer at medium-high speed until creamy.
Gradually beat in sugar until smooth.
Beat in vanilla and gradually add milk until desired consistency is reached.
Separate frosting into three bowls, set the ‘vanilla’ bowl aside, it is done.
Mix cocoa into ‘chocolate bowl’, then set aside.
Mix strawberry flavoring and food dye into ‘strawberry bowl’
Using a melon baller, or very small ice cream scoop, place one small scoop of each ‘flavor’ onto each cupcake, in a row.