Preheat your oven to 425°F (220°C). Line a large sheet pan with foil or parchment paper for easier cleanup.
In a large mixing bowl, combine the cubed sweet potatoes, red bell pepper slices, and red onion wedges. Drizzle with olive oil, and season with smoked paprika, garlic powder, salt, and pepper. Toss to combine until the vegetables are evenly coated.
Arrange the seasoned vegetables on one side of the prepared sheet pan.
In the same mixing bowl, season the chicken thighs with salt and pepper, making sure to rub it into the skin. Brush the BBQ sauce generously over the top and sides of each chicken thigh.
Place the chicken thighs, skin side up, on the empty side of the sheet pan, next to the vegetables.
Bake for 35-40 minutes, or until the chicken is cooked through (internal temperature should reach 165°F/75°C) and the sweet potatoes are fork-tender. If you desire a crispy skin on the chicken, broil on high for an additional 2-3 minutes, keeping a close watch.
Once done, remove the sheet pan from the oven and let it rest for 5 minutes. Garnish with freshly chopped parsley for a pop of color.
Notes
For extra crispy skin, broil the chicken for a few minutes at the end.