Slice the chicken breast into thin strips and toss in a bowl with chili powder, cumin, smoked paprika, sea salt, and black pepper until evenly coated.
Heat the olive oil in a large skillet over medium-high heat until shimmering.
Add the seasoned chicken to the skillet and sauté for 5-6 minutes until golden brown and cooked through, then remove the chicken and set it aside on a plate.
In the same skillet, add the sliced bell peppers and red onion, cooking for 4-5 minutes until they are tender-crisp with slight char marks.
Return the chicken to the skillet, drizzle with fresh lime juice, and toss everything together for 1 minute to combine the flavors.
Divide the cooked quinoa into serving bowls, top with the chicken and vegetable mixture, sliced avocado, and a garnish of fresh cilantro.