Preheat oven to 350 degrees F (175 degrees C).

In a large bowl, beat eggs until light and frothy.

Add heavy whipping cream to the beaten eggs and beat until well combined.

Add thawed and thoroughly drained frozen chopped spinach to the egg mixture.

Incorporate grated parmesan cheese, diced swiss cheese, and chopped cooked ham (or crumbled bacon) into the mixture.

Season with salt and mix all ingredients well until evenly distributed.

Grease a pie or quiche pan with non-stick spray.

Pour the egg and ingredient mixture into the prepared pan.

Bake in the preheated oven for 30 to 40 minutes, or until the eggs are set and the top is lightly browned.

Remove from oven and let stand for 10 minutes before serving.