There’s a lot you can add to these bars- they’re super versatile that way. You can throw some coarsely chopped nuts of your choice into the caramel mixture before you layer it on the crust, or if you enjoy a bit of chewiness and gooeyness, you can also add some mini marshmallows into the mixture.  For some extra chocolatey taste, you can also add some cocoa powder into the crust mixture.