Preheat your oven to 350° f, butter your bundtlette pan or your 10-cup regular bundt pan.
Sift flour, baking powder and baking soda into a bowl, set aside.
In a large bowl, beat butter until glossy and smooth. Add vanilla, salt and sugar and continue beating until fluffy -about 5 minutes if you are using an electric mixer.
In the same bowl with the butter: add egg yolks one at a time, mixing thoroughly after every addition. Scrape the sides and the bottom of the bowl as you continue.
Now we incorporate the flour mixture and the coconut milk in three turns, alternating between the two until no dry bits remain. Set bowl aside.
In a separate bowl, beat the egg whites until soft peaks form - about three minutes. Add the egg whites to the batter in three turns, gently folding after each addition until there are no streaks of egg whites. Add the chunks of mango -withhold the juices as much as you can.
Transfer batter to the bundtlette pan, fill each mini bundt pan about 2/3 of the way full. You may need to bake in two batches depending on your pan.
Bake for about 25-30 minutes, or until a wooden skewer inserted into the center comes out clean. If you’re using a regular bundt pan, bake for 45-50 minutes. Let cakes cool for 20 minutes in the pan and then flip onto a wire rack to cool completely.