Inspired by a reader comment on the Crock-Pot Key Lime Squares, I wanted to perform a little experiment. I was able to stack my pans and cook in the crock-pot that way. I was going to use two foil pans, but found that they would not stack on top of each other but ended up sitting inside of one another. So I went with two different pans and those did sit one a top of the other. Slightly longer to cook then just one pan, but not by much .