Yes, but why would you? They make cloth type of bags that you can toss into the microwave for 5 minutes. There isn't a single oven that can cook a potato in that time.
To quote the great Mitch Hedberg:
Here is an example of a potato cooking bag on Amazon:
http://www.amazon.com/MicrowavePotatoBags-com-Microwave-Potato-Bag-Fiesta/dp/B004WTEGNM
And yes, you are dumb for throwing out a toaster oven. Wouldn't live without em. You know how most things (like pizza) say "Pre-heat the oven to 400 degrees"? Yeah, you ACTUALLY have to pre-heat. Not so with a toaster oven, they heat up damn quickly.
Potato cooking bag!

OMG, never heard of such a thing. Well, I'll check it out, sounds like something I could DIY.
OK, you guys convinced me not to chuck my TO. Last night, in fact, inspired by this thread, I came home and, having no dinner plans, I pulled out the last of a bag of frozen french fries from the freezer and looked to do them up in the TO, as a couple of people recommended here. I riffled through my pans. All my small rectangular pans were just 1/4" or so too long to fit.

I decide on a largish round pie pan. I set the TO to broil, the temperature to 400*. In 10-15 minutes the fries were looking to be interesting. I salted them, they were rather good. It used to take me over 20 minutes to bake the fries in my oven. I'd put them in a cold oven and turn it on to 425* or so.
Looking up my Philips KP9100 I found a driver!

A driver for a TO!

I downloaded it, but wonder how in the world I can update a TO. Anyone know? I also downloaded the PDF manual.
Edit: That potato bag at Amazon says:
Works for potatoes, sweet potatoes, corn on the cob, tortillas & more.
I've been microwaving all those recently. I have just been tossing them in on a plate. Corn on the cob, I just remove some of the outside husks, trim the end and toss it on the platter and cook on high, turning every couple of minutes for a total of 5-6 minutes. Let cool a couple minutes, remove husk, maybe run a little cold water over it and eat, don't bother with butter, salt or pepper.