Start by preheating your oven to 360 degrees F. Then, spritz the bottom and sides of an oven proof pan with a nonstick cooking spray.
Then, mix the eggs with yogurt until well combined.
Overlap 1/2 of the zucchini and leek slices in the pan. Season with salt, black pepper, and cayenne pepper. Add cream cheese and minced garlic.
Add the remaining zucchini slices and leek. Add the egg mixture. Top with Swiss cheese. Bake for 40 minutes, until the top is golden brown. Bon appétit!