Preheat your oven to 425°F (220°C).
In a large bowl, combine olive oil, minced garlic, lemon juice, lemon zest, cumin, smoked paprika, coriander, cinnamon, salt, and pepper. Mix well to create the marinade.
Add the chicken thighs to the bowl and coat them thoroughly with the marinade. Let them sit for at least 15 minutes to absorb the flavors.
While the chicken is marinating, toss the potato chunks with olive oil, dried oregano, garlic powder, salt, and pepper in a separate bowl.
Spread the potatoes in a single layer on a baking sheet and roast in the preheated oven for 20 minutes.
After the potatoes have started to brown, remove the baking sheet from the oven and push the potatoes to the sides to make space for the chicken thighs.
Place the marinated chicken thighs in the center of the baking sheet.
Return the baking sheet to the oven and roast for 40 minutes, or until the chicken is cooked through and the potatoes are tender and golden.
Check the internal temperature of the chicken with a meat thermometer to ensure it has reached 165°F (74°C).
Remove from the oven and let it rest for 5 minutes before serving.