Grate the zucchini and place in a colander. Add the salt, toss with your fingers, and allow the zucchini to sweat out any excess water.
Preheat the oven to 350 degrees. Spray 2 baking sheets with cooking spray.
Squeeze the zucchini, getting out any excess water. Place the zucchini in a bowl along with all the other fritter ingredients. Mix well to combine.
Drop the zucchini fritters onto the baking sheets by heaping tablespoon.
Bake for 25 minutes or until golden brown.
Meanwhile, combine all ingredients for the Tzatziki sauce and refrigerate until ready to use.
Serve zucchini fritters hot with Tzatziki sauce for dipping.