Preheat the oven to 400°F (200°C). Line a baking sheet with foil and place a baking rack on top; spray the rack with non-stick cooking spray.
Combine the toasted cashews and sweetened coconut flakes in a food processor and pulse until the cashews are about the size of panko crumbs; scrape down the bowl as needed.
In a shallow dish, mix the processed cashew-coconut with the panko, brown sugar, salt, onion powder, and garlic powder until evenly distributed.
Place the flour in a second shallow dish. In a third dish, whisk together the 2 eggs and 1 tablespoon lime juice to make the egg wash.
Working one tender at a time, dredge each chicken tender in flour, shake off excess, dip into the egg wash, then press into the cashew-coconut-panko mixture to coat thoroughly; repeat until all tenders are coated.
Arrange the coated chicken tenders on the prepared rack, lightly spray the tops with non-stick cooking spray, and bake for 20–25 minutes or until an instant-read thermometer registers 165°F (74°C).
If desired, broil briefly for 1–2 minutes to brown the coconut and crisp the panko—watch closely so it doesn't burn.
To make the mango honey dip, place the chopped mangoes, honey, 2 tablespoons lime juice, 1–2 tablespoons apple cider vinegar, 1/2 teaspoon cumin, 3 garlic cloves, green onions, and 1/2 teaspoon red chili flakes into a blender and process until smooth.
Taste the dip and add more red chili flakes to increase heat if desired, then serve with the baked coconut-crusted chicken.