In a large pot, saute onions, celery, carrots, basil and parsley in 1 T oil until tender (about 10 min). Add chicken broth, potatoes and hamburger. Simmer for 12-15 min until potatoes are tender.
In another pan melt butter and add flour. Cook and stir constantly for 3 minutes. Add milk, salt and pepper to flour and butter mixture.Cook until it thickens. Add to the pot of veggies. Stir together and remove from heat.
Recipe by Free Time Frolics at https://freetimefrolics.com/2013/02/cheeseburger-soup-recipe.html