Break the eggs in a bowl.Whisk whisk whisk.Add the leftover mushroom and spinach sauce.(or a mixture of pureed blanched spinach and some mushrooms)

Add the sliced yellow pepper and onion.

Heat the low pan.Drizzle oil and swirl it around to coat the pan.

Pour the egg mixture in the pan.Move the egg and veggies around to make the distribution equal.On a low-medium flame cook it covered with a lid for 3 minutes

At this stage the fritata should have risen a bit.Free the edges with a spoon or kinfe.

If you are a pro flip it.If you are like me then heat another skillet or a flat pan.Drizzle some oil and simply flip the pan on the skillet with the uncooked side down.Cook for another 2 minutes and you are done.