To prepare Curried Chicken: Stir yogurt, onion, curry powder, lemon juice, oil, salt and cayenne, if using, together in a medium bowl. Add chicken and toss to coat. Cover and marinate in the refrigerator for at least 2 hours or overnight.
To prepare Chili-Lime Chicken: Stir oil, chili powder, lime zest and juice, garlic, cumin and salt together in a medium bowl. Add chicken and toss to coat. Cover and marinate in the refrigerator for at least 2 hours or overnight.
Preheat oven to 400 degrees F. Line a rimmed baking sheet with foil and create a foil barrier to divide the baking sheet in half.
Place the Curried Chicken, in a single layer, on one side of the foil and the Chili-Lime Chicken, in a single layer, on the other side of the foil. Roast until the chicken is cooked through, 15 to 18 minutes.
