Here's the recipe from The Lucky Laymans:
Preheat your oven to 400 degrees. Place some fajita size flour tortillas on a cookie sheet & heat them until they are golden brown & crispy around the edges (normally 8-10 min). You'll need to watch them as they may bubble up a bit & I just prick them with a fork to flatten out the air bubble. After they are brown, just pull them out of the oven & top them with whatever pizza toppings you want. I normally just use a can of pizza sauce, pepperoni, mozzarella cheese, & mushrooms. I've also made a white pizza version with alfredo sauce, grilled chicken, spinach, & mozzarella. Once you've filled them full of toppings, just put them back in the oven for 5-7 minutes or until the cheese is nice & melted. I normally fix 2 pizzas for each of us because the fajita size tortillas are quite small. You could certainly use bigger tortillas--this is just what I normally have on hand.
As I said, we had chipotle chicken, so I used a ranch-garlic sauce (much like Papa Murphy's - mix ranch dressing [1/3-1/2 a cup] with 2-3 cloves of garlic and voila), the chicken, and both mozzarella and cheddar cheeses. Some sun dried tomatos, bell peppers, or even spinach would have been nice on there, but it wasn't too shabby anyway. We also used some ham and made a more traditional version with fresh garlic chives and basil. Yum!
We chose to make ours on the grill. We grilled one side, flipped and added toppings and closed the grill to let them melt. Super easy and quick. Sorry I didn't take pics! Try it and share your variations!