How Many Of These Foods Have You Eaten?

Pasties, many times. That said, I would guess that Montanan pasties aren't the same as Cornish or otherwise British pasties. Possibly peanut soup. None of the others to my knowledge.

Green Chile Sundae - is this ice cream in a tall glass with a green strip of the country in it?

Biscuits with Chocolate Gravy - both chocolate gravy and putting any kind of gravy on biscuits are alien concepts here.