Heat the oven to 220°C/425°F. In a large bowl mix together harissa, olive oil, cumin and a sprinkling of salt and pepper. Add the potato, chicken and red onion and toss everything together until coated.
Spread the chicken, potatoes and red onion out in a single layer on a baking tray. Place in the oven and cook for 40 minutes. Serve with a slice of fresh lemon for squeezing and the garlic yoghurt.
To Make the Garlic Yoghurt
Mix together the yoghurt, garlic and juice of half a lemon and season to taste.
I did a chicken thigh per person but if you wanted to serve more chicken you could easily add in another four to make this a heartier meal.Nutrition information is an estimate and will vary depending on the ingredients used.