In a pan put the oil and start to fry the onion add the spinach and cook together for 10 minutes
Use a Mixer or the fork to mix the eggs untill make bobbles, add the salt. Add in a bowl the eggs and spinach be sure everything is homogeneus
Add same olive oil around the silicone pan and add the mix.
Put the oven at 370F for 20 minutes.
Test if it is cooked with a toothpick
With help of knife take off the board from pan.
For nice decor put in a plate serve with fresh spinach in the center