You will need:
1.5 litre of egg white
2 cups of spinach
1 yellow onion
2 cups of diced mushroom
2 TBSP of dill ( optional)
2 TBSp olive oil

preheat oven to 400 degrees.
Grease a casserole dish. layer spinach, onion, mushroom and dill. pour on egg whites until all vegetables are covered.
NOTE-depending on the size of the dish you use will determine if its 1 litre or 1.5 litres of egg whites. Ours took 1.5.
Bake for 40 minutes. poke centre with a fork. if its still runny cook for additional 7-10 minutes.
We used this for a brunch we hosted for family and it fed 7 people and we had roughly 5 servings left over. This is a great recipe for meal prep. Makes a healthy breakfast quick and easy.