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Combine the chicken and potatoes in a large bowl. Season with 2 1/2 tsp of salt and 3/4 tsp of the pepper.
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In a small bowl whisk together the harissa, the cumin and 3 tbsp of the olive oil. Pour this over the chicken and potatoes and toss to combine. Let sit for 30 minutes at room temperature.
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Meanwhile, in a medium bowl, combine the leeks, lemon zest, 1/4 tsp salt and the remaining 1 1/2 tbsp of olive oil.
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Heat the oven to 425F
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Arrange the chicken and potatoes in a single layer on a rimmed baking sheet. Ensure that you are not overcrowding the sheet or else they won't brown and crisp up. If needed, use a second baking sheet.
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Roast for 20 minutes. Then toss the potatoes lightly. Roast another 10 minutes.
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Then scatter the leeks over the baking sheet.
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Roast until the chicken is cooked through and everything is golden and slightly crisped, about 10-15 minutes more.
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While the chicken roasts, place the yogurt in a small bowl. Grate the garlic over the yogurt using a microplane or the small holes on your grater. Alternately you can also mince the garlic. Season with salt and pepper to taste.
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Spoon the yogurt over the chicken and vegetables in the baking sheet (or you can place the chicken and veggies onto a serving platter first)
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Scatter the herbs over the yogurt, and drizzle with some olive oil and lemon juice.