Easy Cheeseburger Soup

Bahan-bahan (6 porsi)

• 1 tablespoon olive oil
• 16 ounces lean ground beef
• 2 cups diced onion
• 1 stalk celery, (diced)
• ½ cup minced carrots
• 1 medium garlic clove, (minced)
• 3 tablespoons cornstarch
• 2 cups peeled and diced potatoes, (optional)
• 4 cups beef stock or broth
• 14.5 ounces canned diced tomatoes
• 2 tablespoons Worcestershire sauce
• 1 tablespoon Italian seasoning
• 1 teaspoon ground mustard
• 1½ cups half and half cream
• 2 cups grated cheddar cheese, (divided)
• chopped fresh Italian parsley, (for garnish (optional))