In a small bowl, toss all the spices together. Set aside.
Slice peppers and onions into thin slices. Slice the chicken in long thin strips. In a single layer put the chicken and veggies in a sheet pan. Sprinkle the spices evenly over the chicken and vegetable. Pour oil over everything and mix well. Make sure there is enough oil to coat all the veggies and chicken.
Bake about 25 minutes until the chicken is done and the vegetables are roasted. Squeeze lime over the top. Serve in warm tortilla shells and top with salsa, avocado, shredded cheese, and cilantro.