Preheat oven to 350 degrees F.
Heat some olive oil in a skillet. Add chicken and taco or fajita seasoning (or just shake in some chili powder, onion powder, garlic powder, cumin, and salt and pepper). Add a little water if necessary to dissolve the spices. Alternatively, add precooked shredded or diced chicken to the pan without oil and add spices and water to season meat.
Spray both sides of each tortilla with cooking spray and place them on the middle rack of the oven. Bake for 3 minutes, then flip and bake for about 3 more minutes until golden brown and crispy. (Make sure to watch them closely because they can burn easily).
Remove tortillas from oven and turn oven up to 400 degrees F.
Heat refried beans/bean dip in a small bowl, if desired.
To assemble the pizzas: spread beans on top of one of the tortillas, then add the chicken, top with second tortilla, spread taco sauce evenly on top, add cheese, tomatoes, green onion, and olives.
Bake for 5 minutes or until cheese is melted. Cut each pizza into 4 slices using a pizza cutter.