These Salted Caramel Apple Crumb Bars have slices of juicy apples drizzled with  caramel, sandwiched in between the best crunchy, sweet, brown sugar oat crust and streusel topping. One bowl and so easy to make. I've used the crust and streusel topping from my Salted Caramel Oatmeal Carmelitas. It is the best I've ever tried! Buttery