Heat the olive oil over medium heat in a large non-stick frying pan. Add the onion and cook for 4 to 5 minutes, or until the onions are translucent and lightly browned. Add the spinach, and stir until wilted. Add the spaghetti squash and toss with the other ingredients for 1 to 2 minutes until heated through. Add the eggs, cook for 1 to 2 minutes, then fold the ingredients around. Continue until the egg is set to your liking. Season with salt and pepper to taste; serve immediately.