Copycat Panera Broccoli Cheese Soup - Life with Susan

Name: Copycat Panera Broccoli Cheese Soup - Life with Susan
Prep time: 15 min
Cook time: 50 min
Total time: 1 h 5 min
Cuisine: American
Ingredients: 1 tbsp butter; ¼ cup butter, melted; ½ onion, chopped; 2 cups milk; ¼ cup flour; 2 cups chicken stock; 1½ cups broccoli floret, coarsely chopped; 1 cup carrots, matchstick-cut; 2½ cups Cheddar cheese, shredded; 1 stalk celery, thinly sliced; ground black pepper (to taste); salt (to taste)