Dice the chicken breast into 1-inch cubes and peel the sweet potato, cutting it into 1/2-inch cubes to ensure they cook through quickly.
Heat the olive oil in a large cast-iron skillet over medium-high heat until shimmering.
Add the sweet potato cubes to the skillet and cook for 8-10 minutes, stirring occasionally, until they are tender and have developed a golden-brown crust.
Push the potatoes to the outer edges of the skillet and add the diced chicken, chopped bell peppers, and onions to the center.
Sprinkle the smoked paprika, garlic powder, sea salt, and black pepper over the chicken and vegetables.
Sauté everything together for another 6-8 minutes, stirring frequently, until the chicken is cooked through and the onions are translucent.
Remove from heat and garnish with freshly chopped parsley before serving directly from the skillet.