Preheat oven to 400°. Spray a baking sheet with non-stick spray
Whisk together chili powders, cumin, paprika, coriander, 1.5 tsp salt, 1/2 tsp pepper
Spread ell peppers and yellow onion onto baking sheet
Top with chicken strips and then sprinkle garlic and seasoning evenly over chicken strips
Drizzle olive oil over top then toss everything to evenly coat. Spread into an even layer working to keep chicken from overlapping
Roast in preheated oven, tossing once halfway through cooking, until veggies are tender and chicken has cooked through, about 18-25 minutes (test to 165° in center)
Drizzle lime juice evenly over top of the chicken fajita filling, sprinkle with cilantro and more salt to taste and toss to coat
Serve fillings with warm tortillas and garnishes