Line a baking sheet with parchment paper and lightly coat it with cooking spray. Remove apple stems and insert wooden sticks firmly into the core end. Refrigerate the apples for at least 30 minutes to help the caramel adhere better.
In a food processor, pulse the dried mango until it reaches small, uniform pieces (about 2-3mm in size). Transfer to a bowl and thoroughly blend with chili powder, lime zest, cayenne (if using), and crystallized ginger.
In a heavy-bottomed saucepan, combine sugar, water, and corn syrup over medium heat. Do not stir, only gently swirl the pan occasionally until the mixture turns a rich amber color (approximately 340°F on a candy thermometer). Remove from heat immediately and carefully add the room-temperature cream—the mixture will bubble vigorously.
Return the mixture to low heat, add butter, vanilla, and salt, whisking until perfectly smooth. Continue cooking until the temperature reaches 240°F (soft-ball stage). Remove from heat and let the caramel cool slightly to 210°F.
Whisk two-thirds of your mango chili mixture directly into the warm caramel, reserving the remainder for garnishing. Allow the flavors to infuse for 5 minutes, then transfer the caramel to a smaller, deeper container for easier dipping.
Dip each chilled apple, rotating slowly to ensure even coverage, allowing excess to drip back into the container.
While the caramel is still tacky but not completely set (approximately 2-3 minutes after dipping), roll the bottom third of each apple in your combined macadamia nuts and toasted coconut, then sprinkle with the reserved mango chili mixture. If using edible gold dust, apply it now with a dry brush.
Place finished apples on your prepared baking sheet and refrigerate for one hour to set completely.