Dice the chicken breast into 1-inch cubes and place them in a medium mixing bowl.
In a small ramekin, whisk together the smoked paprika, garlic powder, onion powder, oregano, thyme, cayenne, sea salt, and black pepper.
Sprinkle half of the spice mixture over the chicken cubes and toss until every piece is thoroughly coated.
Thinly slice the red bell pepper, green bell pepper, and yellow onion into strips, then toss them with the remaining spice mixture.
Heat the extra virgin olive oil in a large stainless steel or cast-iron skillet over medium-high heat until shimmering.
Add the seasoned chicken to the skillet in a single layer and sear for 5 to 6 minutes, turning occasionally, until golden brown and cooked through.
Transfer the cooked chicken to a clean plate and set aside.
Add the spiced peppers and onions to the same skillet, sautéing for 4 to 5 minutes until the vegetables are tender-crisp and slightly charred.
Return the chicken to the skillet and toss with the vegetables for 1 minute to combine the flavors before serving hot.