recipe for chicken divan

Ingredients: 2 cups cooked chicken, diced or shredded 2 cups broccoli florets, steamed until tender 2 tablespoons butter 2 tablespoons all-purpose flour 1 cup chicken broth 1 cup milk 1/2 cup mayonnaise 1/2 cup sour cream 1 tablespoon lemon juice 1 teaspoon Dijon mustard