Heat oven to 350. In pie tin, line the bottom with the swiss cheese. Place tin in the oven until the cheese is fully melted, about 8 minutes. Remove and set aside.
In skillet, warm oil and add minced garlic. Quarter the mushrooms and add those to the garlic, tossing until coated before adding the Italian seasoning, salt, pepper, and crushed red pepper.
When mushrooms are al dente, stir in the kale, stems removed, and stir well to get coated in the oil. Add a bit more or splash of water if needed to give enough liquid for steaming. Turn the heat down and cover to allow the kale to wilt.
If you desire a quiche with a bit more body, grate the zucchini and in a mixing bowl, using a paper towel, squeeze as much of the liquid as you can from them. place the zucchini in the pie tin on top of the melted cheese.
When the kale is mostly soft, transfer to the pie tin.
In a mixing bowl, beat together 4 eggs and the cream and whip vigorously until bubbles start to show. Pour onto the veggie mix and top with the shredded mozzarella cheese. If the majority of the vegetables are not covered, beat a few more eggs to add. They should be 90% submerged.
Place in the oven and bake until the top is rounded and slightly golden brown. Remove and let sit for a few minutes before serving. Enjoy!