Set your oven to 375F to preheat.
Crack the eggs in a large bowl and whisk properly.
Add the heavy cream, pieces of ham, grated parmesan and gouda cheese, feta cheese, diced onion, mushrooms, spinach, and of course, salt. Thoroughly mix all into the whisked egg.
Properly grease the pie plate so as to prevent the quiche from sticking to the plate. Spread the oil to the walls of the plate too.
Carefully pour the entire mixture unto the plate. Ensure the mixture spreads to cover the entire plate. Place the pie plate into the preheated oven and allow to bake for 35 minutes.
Remove from oven after baking and allow to cool down for a bit.
Serve in a plate and enjoy.