I've done something similar for years for a quick lunch, but I prefer to use pepperonis instead of hamburger (much faster).

For an easier bite, I like to chop up the the pepperonis and scatter them on top of the sauce, then add the cheese.

But for hamburger, I would prefer a little pizza seasoning, or even just crushed oregano leaves.

You can also try spreading a little bit of olive oil on the english muffins/french bread to give it something a little more. (And don't forget the parmesan, yum!)