Created by KittenCal on December 11, 2011
Step 1: In a medium saucepan melt butter over medium heat. Add in the flour, salt, cayenne and dry mustard stirring constantly until blended (about 1 minute).
Step 2: Whisk in the hot cream; bring to a boil whisking constantly until smooth and thickened. Reduce heat to low and mix in the shredded cheddar cheese until melted. Use as soon as possible.