Preheat your oven to 425°F (220°C). Line a sheet pan with parchment for easy cleanup or lightly oil the surface.
In a small bowl, mix the paprika, oregano, salt, and black pepper. Toss the chicken thighs with half of the spice blend and the olive oil until evenly coated.
Toss the cubed sweet potatoes with a little olive oil, salt, and pepper if you’d like. Spread potatoes in a single layer on the sheet pan.
Nestle the seasoned chicken thighs among the potatoes, skin-side up. Scatter minced garlic over the dish and dot with small cubes of butter.
Roast on the middle rack for 25 minutes. Then flip the chicken skin-side down, baste with any rendered fat, and bake for another 10-15 minutes until the chicken reaches an internal temperature of 165°F (74°C) and the potatoes are tender.
If you like a bit of extra glaze, pour in the chicken broth around the pan and return to the oven for 3-5 minutes to simmer and glaze the potatoes and chicken.
Finish with chopped fresh thyme and rosemary, a squeeze of lemon juice if using, and a final pinch of red pepper flakes for a gentle kick.
Serve hot, spooning any pan juices over the chicken and potatoes for maximum flavor.