In a large bowl, beat the butter until it is smooth and fluffy.
Gradually add the confectioner’s sugar, beating until it is well incorporated and smooth.
Beat in the milk and the extracts until well combined.
Divide the dough into equal portions if you want a variety of colors.
Wrap each portion in plastic wrap and chill for 20-30 minutes.
Remove one portion at a time and knead in the coloring until it is completely blended.
Rewrap with plastic wrap and chill for at least 1 hour.
Repeat for any additional portions.
Line several baking sheets with parchment paper.
Roll each portion of dough into a rope about ½ inch thick or form and cut it into any shape you like.
Cut into small pieces, about ½ inch long.
Place each mint on the prepared baking sheet.
Allow the mints to dry at room temperature for 12-24 hours.
Store the mints in an airtight container.