Preheat oven to 375 degrees. Wash and dry squash, then cut off stem and blossom end and discard. Cut squash lengthwise in half, then slice into half-moon slices about 1/4 inch thick. (Kayln used a mandoline with a 7mm blade, but I just used a knife.)

Heat olive oil in large non-stick frying pan, add garlic and saute about 45 seconds (just long enough to season the oil, don't let the garlic brown.) Add squash slices and saute about 4 minutes, turning a few times. Squash should be barely starting to soften.

While squash cooks, break eggs into a small bowl or glass measuring cup and beat until egg yolks and whites are combined. Stir in sour cream, feta, thyme,  Parmesan, and lemon juice.

Spray a 2 quart gratin dish or glass casserole dish with non-stick spray or olive oil. Layer half the squash in the dish, then season with salt and fresh ground black pepper. (Remember the feta is salty, so it won't need a lot of salt.) Pour over half the egg-feta mixture and use the back of a spoon or a rubber scraper to spread it over the squash. Repeat with another layer of squash and the rest of the feta-egg mixture.

Bake at 375 degrees for 40-45 minutes, or until the mixture is bubbling, slightly set, and top if lightly browned. Serve hot. Makes 6 side dish servings.