Chicken broccoli divan

1 bunch broccoli cut into florets (about 6 florets )

salt and pepper 2 tablespoons butter 600 grams boneless, skinless chicken breast, cut -thick strips 1 small onion, finely chopped (1 cup) Brussels sprouts about( 2 cups) 2 tablespoons flour 3 cups whole milk, room temperature 2 teaspoons Dijon mustard 2 tablespoons of heavy cream 1 teaspoon Worcestershire sauce any kind of pasta you prefer