Oh my these were good! The only thing I did different is 1) I didn't use parchment, I simply buttered the pan very thoroughly. And I made chocolate ganache to pour on top of the caramel layer
https://www.marthastewart.com/1554737/chocolate-peanut-butter-caramel-cereal-bars
https://www.marthastewart.com/1554737/chocolate-peanut-butter-caramel-cereal-bars