olive oil spray
2 medium zucchini (about 1 pound total)
2 egg whites
1/2 cups grated parmesan cheese
1/2 cups dry bread crumbs (plain, such as panko)
1 pinch sea salt
Heat oven to 450 degrees. Coat two baking sheets lightly with cooking spray or thinly with olive oil. Slice zucchini into slightly-less-than 1/4-inch thick rounds; if they feel especially wet, spread them on a towel while you prepare the other ingredients. In a small bowl, lightly beat first egg white with 1 teaspoon water to loosen it. Combine cheese, crumbs, salt and pepper in a separate bowl. Dip each zucchini coin in egg white, letting excess run off before gently dipping them in parmesan mixture. Arrange in single layer on baking sheets. If additional egg white is needed, prepare it the same way, with 1 teaspoon of water. If additional crumb mixture is needed, make a few spoonfuls at a time, matching the volume of crumbs and cheese.
Source : Food.com