In skillet melt 1 tablespoon of butter over medium heat.
Saute onion until transparent.
Squeeze as much water as possible from spinach.
Reduce heat to low.
Saute spinach with onions for 3 minutes.
Season with salt and pepper.
Move spinach and onions to one side of pan.
Melt 2 tablespoons butter in skillet.
Cook eggs until soft set.
Stir spinach into eggs.
Taste. Add salt and pepper if needed.
Garnish with Parmesan cheese.