Ingredients° 1 tablespoon of butter° 1/2 onion, chopped° 1/4 cup melted butter° 1/4 cup flour° 2 cups of milk° 2 cups of chicken broth° 1 1/2 cup coarsely chopped broccoli florets° 1 cup carrots cut into matchsticks ° 1 stalk celery° 2 1/2 c Cheddar cheese° Salt & ground black pepper PreparationMelt 1 tablespoon of butter in a skillet over medium-high heat. Sauté onion in hot butter until translucent, about 5 minutes. Put aside. Whisk 1/4 c butter / flour together in saucepan over medium-low heat; cooking to flour loses its graininess, adding 1 to 2 tablespoons milk if necessary to prevent flour from burning, 3 to 4 minutes. Gradually pour the milk into the flour mixture, whisking constantly. Stir the chicken broth into the milk mixture. Bring to the boil; cook until the flour taste disappears and the mixture thickens, about 20 minutes. Adding broccoli, carrots, sautéed onion and celery; simmer until vegetables are tender, about 20 mn.Enjoy !