These cookies are like a combination of a pretzel cookies and dulce de leche cookie. And chocolate!
If you want to make your own dulce de leche -- which I do encourage -- you should do it a day in advance. And if you don't make your own, you can find it pre-made in most chain Mexican markets like Vallarta. You can also order it at Mex Grocer.
You can find chocolate -covered pretzels in most markets.