Sift powdered sugar to break any lumps. Set aside.
In a separate mixing bowl, cream butter and salt over medium speed until smooth. Add the sifted powdered sugar, a little at a time until well combined. Mix on very low speed to avoid the sugar from flying all over. Alternatively, mix the sugar briefly with a spoon (by hand) to moisten it slightly before using the mixer.
Beat until all the sugar is well combined with butter. It may appear crumbly at this point and that is perfectly fine.
Add condensed milk and the peppermint extract and continue beating. If the mixture is still crumbly, try pressing the mixture with your fingers, if it comes together into a dough, it is ready for rolling and cutting.
Divide the dough into 2 sections. Color the first section in gold and the other section in fuchsia. Knead well to distribute the color evenly.
Turn the doughs onto a clean surface (dust with powdered sugar if still sticky) and roll both into long ropes.
Twist both colors together. Doing this can be a little tricky especially if the ropes are long as they tend to break when twisted. It is best to do with shorter strips. If there are any cracks, pinch the cracks together to patch the cracks.
Roll the twisted mint rope until it becomes smooth and is of the thickness preferred.
Cut the roll into equal lengths with a sharp knife. Place the cut mints on a clean parchment paper and let them rest at room temperature overnight. The next day, turn them over and let them set again for another day until they have dried and set well before storing them in a candy jar.