Delicious Chicken Fajita Pizza Recipe!

1 pound skinless, boneless chicken breasts Olive or avocado oil Salt Black pepper ½ teaspoon ground cumin ½ teaspoon paprika 1 red bell pepper, sliced into thin strips 1 yellow bell pepper, sliced into thin strips 1 large onion, halved and slice thinly into semi-circles 4 personal-size, par-baked pizza crusts (such as Boboli brand, or other) 4 cups shredded Mexican cheese blend Cilantro leaves, for garnish