In a mixing bowl, combine 1 cup of mascarpone cheese, 1/2 cup of powdered sugar, and 1 teaspoon of vanilla extract. Use a hand mixer on medium speed for about 2-3 minutes until smooth and fluffy.

In a separate bowl, whisk together 1 cup of full-fat coconut milk and 2 tablespoons of rum (or an extra teaspoon of vanilla extract). Allow this mixture to sit for about 5 minutes.

Arrange ladyfingers in a single layer and dip each into the soaking mixture for 1-2 seconds. Lay soaked ladyfingers in serving dish.

Spoon half of the mascarpone mixture over the first layer of ladyfingers and spread evenly.

Repeat soaking and layering with the remaining ladyfingers, then top with the remaining mascarpone mixture.

Cover with plastic wrap and chill for at least 4 hours, ideally overnight.

Before serving, sprinkle toasted coconut flakes on top.