Prepare your mise en place.
Melt the butter in the small saucepan over medium heat. Using a wooden spoon, stir in the flour and cook for 1 minute.
Whisk in the marmite and bring to a simmer, whisking constantly. Lower the heat and cook, stirring frequently with a wooden spoon, for about 15 minutes or until a smooth velouté has formed.
Stir in the cre