Now that I'm cooking for one, I had this same thought so bought myself a toaster oven about 2 yrs. ago. It's the only way to go when I just want a pc. of froz. pizza for dinner. I've baked lots of things in it.
It avoids heating the whole oven.
Plus, when I have the kids & g-kids in, it gives me an extra oven. Smartest thing I've done in a long time. I put it on the counter in my laundry rm. which isn't far from the kitchen. Only way to go in my opinion.