Cheeseburger Soup

Ingredients

• 1/2 lb. ground beef
• 3/4 c. chopped onion
• 3/4 c. shredded carrots
• 3/4 c. diced celery
• 1 tsp. dried basil
• 1 tsp. dried parsley flakes
• 4 Tbsp. butter or margarine, divided
• 3 c. chicken broth
• 4 c. diced peeled potatoes (1 3/4 lb.)
• 1/4 c. all-purpose flour
• 8 oz. process American cheese, cubed (2 c.)
• 1 1/2 c. milk
• 3/4 tsp. salt
• 1/4 to 1/2 tsp. pepper
• 1/4 c. sour cream