Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.
In a large bowl, cream together butter and powdered sugar until light and fluffy.
Mix in vanilla extract and mango extract until smooth.
In a separate bowl, whisk together flour, cornstarch, and salt.
Gradually add dry ingredients to the butter mixture, mixing just until combined.
Fold in chopped dried mango and shredded coconut.
Scoop tablespoon-sized portions and roll into balls. Place 2 inches apart on baking sheet.
Bake for 11–13 minutes, until bottoms are just lightly golden (tops should stay pale).
Cool cookies for 5 minutes, then gently roll warm cookies in powdered sugar.
Once fully cooled, roll again in powdered sugar for a snowy finish.