Lightly dust a clean countertop or large cutting board with powdered sugar.

In a large bowl, mix the softened butter and sweetened condensed milk until smooth and creamy.

Stir in peppermint extract and a pinch of salt.

Gradually add powdered sugar, mixing until a soft dough forms. If the dough feels sticky, add a little more powdered sugar.

Divide dough into portions and knead in gel food coloring for festive red and green mints.

Roll dough into small ropes and cut into bite-sized pieces, or shape into little balls. Optional: flatten slightly with a fork for a classic look.

Place mints on a tray lined with parchment paper and let them dry at room temperature for 2 to 3 hours or overnight until firm on the outside but still soft inside.