In a mixing bowl, add the first 3 ingredients and whisk together.
Cut in the shortening with a sturdy fork until the mixture looks like coarse crumbs.
Add the milk all at once and use the fork to mix just until the dough is mixed and balled to the fork and moves around with it.
Place dough on a floured surface and gently kneed for 30 seconds.
Roll dough out to a rectangle, ¼ inch thick.
Sprinkle cheese evenly over dough.
Roll up like a jelly roll.
Start on one end of the roll and cut into ½ inch slices.
Place slices, cut side down, on your hot casserole before it goes in the oven.
Bake in a hot oven, about 220° C (425° F), for 15-20 minutes or until the biscuits are done.