Sweet Potato Pizza with Caramelized Onions and Bacon

Sweet potatoes on pizza?  Yeah, I know -- it sounds weird.  And it looks weird putting it together.  But it tastes really good, adding an almost creamy feel to your pizza. Caramelized onions weren't in the original recipe, which is here, but I like them, and because I was making a vegetarian version of this, I wanted a little extra flavor with the sweet potatoes.  I used Canadian bacon instead of regular bacon -- it was already cooked, but crisping it up in a pan first adds flavor and texture.  For cheese I used a combination of mozzarella and Comte.  It's hard to see the sweet potatoes under all the other toppings, but they're there (see below).