1. Shred zucchini, sprinkle with salt and let stand for 5 minutes. Use a clean kitchen towel or paper towels to remove excess moisture (the more moisture you remove, the better).
2. In a bowl, combine zucchini, ground turkey, onion powder, garlic powder. Season with salt (a little less than you would usually do, because zucchini have some salt already) and pepper. Mix well.
3. Heat oil in a large skillet over medium-high heat. Place a heaping tablespoon of the mixture into your hand and form a round flat patty. Cook over medium-high heat for 3 minutes, then flip and cook for another 3-4 minutes more, until golden brown and cooked through. Remove from skillet, drain on paper towels. Add more oil as needed for next batches.
4. Prepare the sauce. In a small bowl, combine mayo, maple syrup and mustard. Stir well. Serve fritters with the sauce.