Copycat Cheeseburger Soup

Ingredients

• 1/2 pound ground beef
• 4 tablespoons butter, divided
• 3/4 cup onion, chopped
• 3/4 cup carrots, shredded
• 3/4 cup celery, diced
• 1 teaspoon dried basil
• 1 teaspoon dried parsley flakes
• 1 3/4 pounds potatoes, cubed and peeled
• 3 cups chicken broth
• 1/4 cup all-purpose flour
• 2-4 cups processed cheese, shredded
• 1 1/2 cups whole milk
• 3/4 teaspoon salt
• 1/4-1/2 teaspoon pepper
• 1/4 cup sour cream
• onion rings, optional, to taste, warm, for serving
• green onions, optional, to taste, thinly sliced, for serving