Combine the eggs and milk in a small bowl and whisk well until mixture is fluffy
Add the baby spinach, parmesan, feta and dried herbs. Season with salt and pepper and mix again until well combined.
Heat a non-stick frying pan over high heat. Pour the omelette mixture over the entire base. Cook for 2-3 minutes or until golden and then carefully flip over to cook the other side.
Meanwhile, toast the wholegrain sourdough bread. Top each slice of bread with a drizzle of olive oil and half of the omelette.