My Mom used to make these all the time when I was a kid and it was one of my favorites for lunch. It is quick and easy to make.
Cut the hot dogs horizontally almost all the way through, but not quite.
Slice or tear each piece of cheese into 4 strips for each slice and put them in the center of the hotdogs.
Add mustard to the center of the hotdogs.
Flatten out a biscuits and wrap it around the hotdog.
Pinch the edges of the biscuit "blanket" shut and bake according to the directions on the biscuit package.