Combine all the ingredients for the spice mix in a small bowl, mix together with a whisk and set aside.
In a large mixing bowl, combine the chicken strips, bell peppers, onions, chopped cilantro, olive oil and lime juice. Add spice mix and toss well, until evenly combined and coated.
Spread into an even layer onto the prepared baking sheet and bake in the preheated oven, tossing once halfway through cooking, until the veggies are tender and the chicken is cooked all the way through, about 20-25 minutes.
Once cooked, remove from the oven and garnish with fresh chopped cilantro.
Serve with flour tortillas, sour cream, diced tomatoes and lime wedges, if desired.