Cheeseburger Soup

Name: Cheeseburger Soup
Ingredients: 1 tablespoon olive oil; 8 slices bacon , chopped into 1-inch pieces; 1 pound lean ground beef , 90/10 blend; 2 cups russet potatoes , peeled and diced; 1 small yellow or white onion , grated with large box grater; 1 stalk celery , diced; 1 teaspoon Italian seasoning; 1 teaspoon kosher salt; 1/2 teaspoon ground black pepper; 1/4 cup all-purpose flour; 2 cups beef stock; 2 cups whole milk; 8 ounces cream cheese; 2 cups shredded cheddar cheese , plus extra for garnish; Chopped scallions , for garnish