Preheat oven to 350 degrees Fahrenheit.
In a mixing bowl fitted with a paddle attachment (or an electric hand mixer), beat butter on medium to high speed for 30 seconds.
In a separate bowl, stir together flour, baking powder, baking soda, and salt. Set aside.
Gradually add sugar to the butter, about 1/4 of a cup at a time, beating on medium speed until combined. Scrape down the sides of the bowl and mix for another minute or so.
Add eggs, one at a time, beating well after each addition.
Beat in pink lemonade concentrate and vanilla extract.
Alternately add flour mixture and buttermilk, beating on low speed after each addition, just until combined.
If desired, add a few drops of pink food coloring.
Scoop batter into a muffin tin lined with muffin cups.
Bake for 25-30 minutes, or until a toothpick comes out clean. Cool completely before icing.