Make the béchamel sauce (1 ½ cups); in a medium pot over medium heat, add butter. When melted, add flour and cook, stirring constantly, for about 4 minutes or until it smells like cooked pie crust. Add 1 cup milk, whisk and then a little at a time, whisking constantly. Add salt and white pepper.
To make the cheese sauce; add paprika and mustard powder to the béchamel sauce before stirring in cheese; whisk until melted. Spoon over steamed vegetables and serve immediately. Makes 3 cups.
Note: If not using right away, cover with wax paper making sure it touches the surface – this will prevent a skin from forming.