@Stella4: You can sometimes find the mixes which I'm sure would have directions, but I've never had those. Just the Vitatops or whole muffins - those are already baked, but they come frozen bc the company doesn't use preservatives. I just pull one out of the freezer at 8am and it's thawed by 10am for my break. Or pop in in the microwave on defrost for half a minute.
I've only tried the Deep Chocolate and the Corn. The Deep Chocolate is good - I've read reviews that say it's one of the best. The cake by itself isn't over the moon but so long as you get a chocolate chip in there it's just fine
The corn is so-so. No grit like real cornbread so the flavor seems a bit..off. I suppose it would be better warmed up with a smidge of country crock or something.
I once read a (very very thorough) review over at Amazon from someone who bought the big variety pack and they detailed all the muffins. Apparently a number of them taste more "diet" than others.