Slice the chicken breast into thin, even strips and place them in a small bowl.
In a separate small dish, combine the chili powder, ground cumin, garlic powder, sea salt, and black pepper.
Toss the chicken strips with half of the spice mixture until well coated.
Slice the red and green bell peppers and the yellow onion into thin strips.
Heat the olive oil in a large cast-iron skillet over medium-high heat until shimmering.
Add the chicken to the skillet and cook for 5-6 minutes, stirring occasionally, until golden brown and cooked through.
Remove the chicken from the skillet and set aside on a plate.
Add the peppers and onions to the same skillet, adding a splash of water if the pan is too dry, and season with the remaining spice mix.
Sauté the vegetables for 4-5 minutes until they are tender-crisp and slightly charred.
Return the chicken to the skillet and stir to combine with the vegetables.
Drizzle the fresh lime juice over the mixture and garnish with chopped fresh cilantro before serving.