Score the flesh of the chicken and toss in 1 tbsp oil and honey, transfer to a baking tray with the onion, then season.
Mix together the oats and Cajun seasoning. Toss the sweet potato wedges in the remaining oil and coat in the oats and thyme, add to the baking tray, and sprinkling over any remaining oats. Bake for 30 minutes until the chicken is cooked throughout.
Hint and tip: for a quick and easy way to coat the sweet potatoes in the oats, Cajun seasoning, and thyme, place in a large plastic bag, toss in the oil, and shake the bag to coat evenly.