Mediterranean one-pan chicken

Ingredients

• 350g sweet potato, diced
• 1 red onion, sliced
• 1 teaspoon olive oil
• 375g chicken breasts, chopped
• 4 tomatoes, roughly chopped
• 1 courgette, roughly chopped
• 1 teaspoon paprika
• 1 teaspoon dried oregano
• 25g black olives, roughly chopped
• 50g tzatziki, to serve