Preheat the oven to 400°F.

In a large cast-iron skillet, toss the onion with the bell peppers, garlic and sliced chicken. Add the oil and toss until everything is well coated.

Season the chicken mixture with the taco seasoning, chile powder, salt and pepper. Mix to combine.

Place the cast-iron skillet in the oven. Roast the mixture until the chicken is cooked through and the vegetables are tender and lightly browned, 30 to 35 minutes.

While the chicken mixture cooks, prepare the garnishes. When the skillet comes out of the oven, garnish the chicken mixture with the cilantro and a few squeezes of lime juice.

To serve, scoop some of the chicken mixture onto warm tortillas and garnish with your favorite toppings.

Note: For a make-ahead meal, toss the chicken and vegetables with the seasonings in the morning and refrigerate in an airtight container. Then all you have to do in the evening is preheat the oven, add the mixture to the skillet and pickup the recipe at step 4.