Place all the ingredients in a large resealable freezer bag.
Remove excess air, seal, and freeze.
Thaw the soup overnight in the fridge.
Slow cooker on low for 4 hours or on high for 3 hours.
Alternatively, you may cook this in the Instant Pot on manual high for 20 minutes.
Once cooked, use an immersion blender to blend the soup.
Top soup bowls with sliced green onions, bacon, and a sprinkle of cheddar cheese.