Big Batch Cheeseburger Soup

Ingredients

• 1 pound lean ground beef (90% lean)
• 1 small onion, chopped
• 1-3/4 pounds potatoes (about 3-4 medium), peeled and cut into 1/2-inch pieces
• 3 cups chicken broth
• 1-1/2 cups whole milk
• 2 medium carrots, shredded
• 1 celery rib, finely chopped
• 1 tablespoon dried parsley flakes
• 1/2 teaspoon salt
• 1/2 teaspoon dried basil
• 1/4 teaspoon pepper
• 1 package (8 ounces) Velveeta, cubed
• 1/4 cup sour cream
• Chopped fresh parsley, optional