preheat the oven at 180 degree Celsius
grease the Muffin tray with oil
heat of the oil in the pan add chopped onions Saute until translucent
add chopped tomato and cook until mushy
add washed spinach leaves and Saute until it shrinks and switch off the flame
take a mixing bowl ,break eggs and add to the bowl
now add all the Saute mixture into the eggs and whisk well until combined
ladle the egg mixture into the greased tray and bake for 15 to 20 minutes until the top becomes little firm
allow it cool completely and remove from baking tray
serve it with source of your choice