I've made this several times and it's fantastic. I live in wisconsin so white cheddar is easy to get but one can use yellow cheddar or any melty cheese. I add a bit of chili pepper and cayenne to add some zip. Perfect for a hearty meal!
I made this soup using 10oz thin deli sliced landolakes white cheddar cheese that I got from the deli at my local Walmart, half a cup of onions, and 4 cups of chicken stock. Let me say none was left it was absolutely divine, my whole Family loved it!
Followed directions to a t. Soup came out bitter was inedible.