Preheat oven to 375F.
Cook 1 lb macaroni noodles normally and drain.
In a blender, combine all cheese ingredients except oil. Blend well. While blender is still on, drizzle oil into the center of the blender very slowly (will take a few minutes.).
Put macaroni in baking pan and lightly coat with regular mustard. Pour in cheese sauce and stir well to combine.
Bake at 375 F for 20-25 minutes, until sauce starts to bubble.