I finally had a muffin (well, let's be honest, it was two) for breakfast this morning. All I can say is wow. I wasn't sure what to expect since the recipe I used called for brown sugar instead of white and only the egg whites, not whole eggs - I think it was (gasp) a low-fat recipe. But never fear, the extra half cup of chocolate chips I added really put them over the top. They don't look like they have a lot of chips in them when they're whole, but once you bite into them you can see all the chocolately goodness.
Definitely a HUGE thumbs up!