Preheat oven to 190C, fan. Cut your sweet potatoes and onion into small cubes and place them in a baking tray with the drained sweet corn. Drizzle over some olive oil, a sprinkle of cumin, salt and pepper and give it all a really good mix to make sure everything is coated. Bake in the oven for 35-40 minutes until golden. When cooked, remove from the oven and stir through the chopped chives and chilli flakes. Serve with some sliced avocado, toasted bread and coconut yogurt.