That's the name I've given it....I don't know its official name, but I call it pizza cuz it's round. I learned it at a Pampered Chef party Monday night and have already cooked it for my family this week. It is very good! Like I said, I don't have the official recipe, but here's how I made it. Adapt as you need.
Saute chopped onion and minced garlic in a large skillet. Add cooked chicken, salsa, and southwestern seasonings of your choice (I used chili powder and cumin). Cook until warmed.
Put large flour tortilla in round deep dish baker, spread with refried beans, then chicken mixture, then shredded cheddar cheese. Repeat layers until dish is full. Cover with flour tortilla, shredded cheese and tomato slices.
Bake in 350 oven until warmed through and cheese melted.
Edited: Note: I found out the official name for this dish is "Southwestern Lasagna" because of its layers. The pizza name still fits, I think, because its round. So, you pick what you want to call it and go with it!