I suspect a plain hair dryer can't produce that much heat, however a hot air gun should work neatly (I used routinely a Bosch PHG 600-3 and I want to point out that you can seriously burn yourself if you don't properly handle it).
Alton Brown, in a recent Good Eats episode, went through the several ways to toast bread for croutons:
I've seen him recommend heat guns on other occasions so I bet it would work just fine.
Today I learned that you can toast marshmallows in the oven.
By "learned", I mean "I read a recipe which included as a step toasting marshmallows in the oven". I didn't have to try it out to realize that this would obviously work. It was plain as soon as I heard the idea. And it shouldn't have needed pointing out. I know how ovens work. I am familiar with the marshmallow species of food. I love roasted marshmallows while hating them in most other forms and often occurrently lament the difficulty of arranging open flames over which one may safely toast them. I routinely try new things in the kitchen to get results I want.
And yet I read it, and was surprised. And so were the people I reported this finding to. It needed pointing out.
What other facts need pointing out, although they are plain on inspection? What is the pattern behind these facts and a good way to find more?