Preheat the oven to 200°C. Place a 24-cm ceramic flan dish on a baking sheet and place in the oven to heat up.
Meanwhile, crack the eggs into a large mixing bowl and whisk with the cream. Season well with salt and pepper. Stir in the spring onions, asparagus, chicken and sweetcorn.
Remove the flan dish from the oven, pour in the olive oil and swirl it around the dish to coat the base and sides. Carefully tip in the filling and place the quiche back in the oven. Bake for 15–20 minutes until golden and just set.
Remove from the oven and serve warm with balsamic-dressed rocket leaves or a homemade tomato sauce.