Does one whole bagel yield one pizza-bagel or two pizza-bagels?

At the bagel company I worked for, you cut the bagel in half, add to both halves tomato/sauce, add peperoni, or whatever, top it with cheese, sprinkle on spices, then bake in the toaster.

So you would end up with 2 pizza bagels.

Same with a bagel tuna melt.