How to Make It
Heat oven to 350˚F. Gently cook the onion in the oil for 5-7 minutes, to soften. Turn off the heat, add the spinach to the pan, and stir until it starts to wilt.
Spoon the onion and spinach into a 8-inch round, solid-based pan, buttered and lined with parchment paper.
Add the feta cheese and olives to the onion and spinach mixture; stir to mix up slightly. Season the beaten eggs well, and pour over the vegetables.
Bake in the oven for around 20-25 minutes, or until just set. Cut into wedges to serve.