I would like recipes using brownie box mixes that you might add other stuff to to make it more than just plain brownies. For example, I've seen where sometimes people add a cream cheese mixture to swirl in and make marble brownies. The boxes I buy don't usually have recipes on the back and I'd like to see how inventive some of you are. I often have to bring snacks to work and would like something easy but special. TIA!

Brenda