Slice the chicken breast into thin, even strips.
In a small mixing bowl, whisk together 1 tsp of olive oil, lime juice, chili powder, cumin, smoked paprika, sea salt, and black pepper.
Toss the chicken strips in the marinade until thoroughly coated and let sit for 5 minutes.
Heat the remaining 1 tsp of olive oil in a large skillet over medium-high heat.
Add the sliced bell peppers and red onion to the skillet, sautéing for 4-5 minutes until they are tender and show slight charred marks.
Remove the vegetables from the skillet and set aside.
Add the marinated chicken to the same skillet and cook for 5-7 minutes, turning occasionally, until golden brown and cooked through.
Return the sautéed vegetables to the pan and toss with the chicken to warm through.
Transfer the mixture to a bowl and garnish with fresh avocado slices and chopped cilantro.