Preheat the oven to 400°F (200°C) and line a baking sheet with non-stick foil or parchment; set aside.
In a shallow dish, combine the crushed fried onions, grated Parmesan, panko breadcrumbs, and garlic powder; mix well.
In a second shallow dish, whisk together the eggs, mayonnaise, and water until smooth.
Place the flour in a third shallow dish.
One at a time, dredge each chicken tender in flour, shaking off excess, then dip into the egg mixture, and finally press into the fried-onion mixture to fully coat; place coated tenders on the prepared baking sheet.
Lightly spray the tops of the coated chicken tenders with cooking spray to help browning.
Bake in the preheated oven for 20 to 25 minutes, until the chicken reaches an internal temperature of 165°F and the coating is golden and crisp.