Carmelitas are a no-mixer, layered bar, and the crust and topping are made with the same buttery, brown sugar, vanilla-infused oatmeal and flour mixture. In the middle there's chocolate and caramel sauce. They're like the softest oatmeal chocolate chip cookie, with a streusel-crumble topping, and more melted caramel than you have napkins for. The oats provide a light amount of texture and chewiness to the otherwise buttery-soft bars, just oozing with juicy caramel everywhere. You can add salt, to taste, to the caramel sauce for salted carmelitas. I melted caramels with heavy cream (in the micro, use stovetop if you prefer), and while I haven't tried using a jarred sauce like Trader Joe's Salted Caramel, I think you'd be okay; I'd use 1 1/2 jars. You must let these bars set up for at least 4 hours before slicing, but overnight is strongly recommended.