1.  Heat BBQ according to package directions. In the final two minutes of cooking, top with the cheese slices until melted.
2.  Spread mustard on 4 of the slices of toasted bread.
3.  Divide the cheesy BBQ between the four slices (this is a meaty sandwich!).
4.  Add pickles if desired before topping with the remaining slices of toast.
5.  Serve hot.