Using a large ice cream/cookie scoop, drop the dough onto your prepared baking sheet(s). Sprinkle the tops with a little bit of sea salt. Using a butter knife, take a dollop of dulce de leche and swirl it into the top of each ball of dough. Bake for 16-18 minutes. Top with banana chips and leave cookies to cool on the pan for 3-5 minutes before transferring to a wire rack or cool baking sheet.