In a large mixing bowl, combine the sweetened condensed milk, softened unsalted butter, and peppermint extract. Use a hand mixer until smooth.

Gradually add in the powdered sugar, mixing on low speed until you achieve a soft, pliable dough.

If the dough feels too soft, cover it with plastic wrap and chill in the refrigerator for 10-15 minutes.

Once firm, roll small portions into balls or use cookie cutters for shapes. Lay on a parchment-lined baking sheet.

Let the shaped mints sit at room temperature for about 1 hour or refrigerate for quicker setting.