Preheat oven to 425 degrees. Spread the sauce over pizza and sprinkle with mozzarella cheese and half of the cheddar cheese. Top pizza with chicken, green chilies and the remaining cheddar cheese. Add onions and sprinkle queso fresco on top of onions.
Place pizza in preheated oven and bake for 15 minutes until cheese is bubbly and pizza is hot. Slice and serve.