I'm going to play around with the ingredients that I *think* are in the potpie: pumpkin, yams/sweet potatoes, butternut squash and cheddar cheese. It seemed slightly creamy, so I may add in some evaporated milk. (I'm sure they used some cream) I seem to remember a few random cherry/grape tomatoes in there too.
I'll jot down what I'm doing (for once!) and pass it on if it turns out.
Happy Thanksgiving! -A