Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel the sweet potato and dice it into half-inch cubes, then finely chop the red bell pepper and red onion.
Place the sweet potatoes, peppers, and onions on the baking sheet and toss with 0.5 tbsp of olive oil, smoked paprika, garlic powder, and half of the salt and pepper.
Spread the vegetables in a single layer and roast for 20 to 25 minutes, tossing halfway through, until the potatoes are tender and golden brown.
While the hash roasts, season the chicken breast on both sides with the remaining sea salt and black pepper.
Heat the remaining 0.5 tbsp of olive oil in a cast-iron skillet over medium-high heat.
Sear the chicken for 5 to 7 minutes per side until the internal temperature reaches 165°F and the outside is nicely browned.
Remove the chicken from the pan and let it rest for 3 minutes before slicing into strips.
Divide the roasted sweet potato hash between plates and top with the sliced chicken breast.
Garnish with freshly chopped parsley and serve immediately while hot.