Preheat oven to 425 degrees. Line a sheet pan with parchment paper. Season thighs, sweet potatoes and onion with ... Pour marinade over chicken and vegetables to generously coat.

Place a rack in the top of the oven ... to the onions, and give them a mix. Reduce the heat to medium; the onions should be gently sizzling. Stir occasionally and cook until soft, about 10 minutes.

You can cook the potatoes while you reheat the sauce. Heat a large saucepan over a medium heat. Add the oil and, once hot, add the chicken thighs ... or until the onions are soft and translucent.

Place a rimmed nonstick baking sheet on the lower rack in the oven and preheat the oven to ... Carefully dip the chicken thighs in the oil, being sure to coat both sides evenly, and set them ...

In a large mixing bowl, combine the chicken thighs ... If the potatoes need a little more browning, remove the chicken and set it aside to rest, returning the potatoes to the oven for 10-15 ...