Preheat oven to 400 F. Set aside a large baking sheet.
On a work surface, cut chicken breasts, onions and peppers into 2-3 inch strips.
Place chicken, peppers, onions on the baking sheet. Sprinkle cumin, garlic, paprika, salt and pepper on top and drizzle with oil.
Using tongs or two spoons, toss all ingredients on the pan to coat evenly.
Bake for 15 minutes.
Remove from oven, and use tongs to slide the ingredients one quarter of the way around.
Mop up excess juices with a paper towel, and then add the tortillas to the pan. Return to the oven and bake for 5 more minutes.
Remove from the oven and squeeze optional fresh lime on top.