Add green onions and cook a few minutes over low until they just start to soften.
Add all of the remaining ingredients but the shrimp to a slow cooker.
Cook on low for 90 minutes to 2 hours until melted.
Stir occasionally.
Add shrimp.
Cook on high for another 15 minutes or so or until shrimp turns pink.
Taste to see if a little salt and pepper or extra hot sauce is needed.
Serve soup in bowls with some extra scallions on top.
Great with bread for dunking!
Notes
You can also make this on the stove. Use a non-stick large soup pan. Start by cooking the onions and butter. Add all ingredients but shrimp. Bring to a simmer often, being careful not to burn. When all is melted, add shrimp and simmer on low until shrimp turns pink.