Preheat oven to 350 degrees.
Thaw frozen spinach and drain, squeeze out as much water as possible. Set aside.
Thinly slice mushrooms.
Heat oil and garlic in a large skillet. Add mushrooms and cook until tender.
Add spinach to mushrooms and salt, pepper and nutmeg cook until spinach is heated through.
Drain spinach/mushroom mixture in a colander.
Grease a 9 inch pie plate then sprinkle parmesan all around to coat plate.
In a bowl, whisk eggs then add cream and cottage cheese and stir well.
Stir in mushrooms and spinach mixture.
Pour into pie dish. Sprinkle with mozzarella.
Place pie dish on a baking sheet and cook for 50-60 minutes or until set in center and browned around edges.
Turn oven off and allow to sit in oven for 10 minutes.
Stand 10 more minutes before slicing.