Cheeseburger soup

1 lb bacon
2 lbs hamburger
.25 cup butter
1 cups onions (chopped)
1 cups carrots (sliced)
2 tsps basil
5 cups chicken broth
2 cups cauliflower (broken up)
.6 lb grated cheese
2 cups cream (or 3 cups half-and-half)
1/2 tsp salt
1/2 tsp pepper
1/2 cup sour cream