1Heat oven to 400º. Place tortillas on ungreased cookie sheet. Bake about 5 minutes or until crisp.
2Mix peanut butter, soy sauce, vinegar and sugar; spread over tortillas. Top each with 1/4 cup of the cheese. Spread chicken and vegetables evenly over tortillas. Sprinkle with remaining 1/2 cup cheese.
3Bake 10 to 15 minutes or until pizzas are hot and cheese is melted.