Preheat your oven to 400°F (200°C). Arrange all ingredients and tools nearby for smooth prep.
Pat the chicken thighs dry with paper towels, then season generously with salt, pepper, paprika, and chopped thyme on both sides.
Heat the olive oil in a large ovenproof skillet over medium-high heat. Once shimmering, place the chicken thighs skin-side down and sear until the skin is golden brown and crisp, about 5-7 minutes.
Flip the chicken thighs and cook for another 3-4 minutes to nicely brown the other side. Then transfer the skillet off the heat.
Add the sweet potato chunks and red onion slices around the chicken in the skillet. Drizzle with a bit more oil if needed, then sprinkle with a little extra thyme, salt, and pepper.
Scatter the minced garlic over the vegetables, ensuring it’s spread evenly for aroma and flavor.
Place the skillet in the preheated oven and roast for about 30-35 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender and caramelized around the edges.
Remove the skillet from the oven, let it rest for a few minutes, then serve the chicken pieces alongside the roasted sweet potatoes and vegetables, drizzled with any pan juices.