This Cheesy Zucchini Casserole, you won't believe how good it smells as it bakes... honestly, it fills the house with such a delicious fragrance, you'll probably want to make it regularly if only for that reason!
Slice the zucchinis as thinly as you possibly can (the use of a mandoline is strongly recommended) and arrange the slices vertically in a 10" round baking dish
Combine the chicken broth, heavy cream, eggs, minced garlic, cornstarch, Dijon mustard, oregano, thyme, salt, pepper and nutmeg in a large glass measuring cup; whisk carefully but vigorously until well combined, then pour over the zucchinis.
Sprinkle about half the crumbled feta cheese across the top and place the casserole in the preheated 375°F for 35 minutes; then, lower the oven temperature to 350°F and continue cooking for 20 to 25 minutes, until the top is nicely browned and the sauce bubbles around the edge. Remove from the oven, sprinkle the rest of the feta cheese.
Let the casserole rest for about 5 minutes before serving.