Preheat oven to 500 F degrees.
Roll out the pizza dough and place on a pizza baking pan, or a pizza stone.
In a large skillet, saute the onion and pepper in the olive oil until onion is slightly caramelized.Season with salt, pepper and chili powder. Add shredded chicken and toss everything together.
Spread salsa over the crust. Top with mozzarella cheese. Top with the chicken mixture evenly over the entire pizza. Top with the Mexican cheese blend.
Bake for 10 to 15 minutes or until cheese is bubbly and crust is golden brown.