Preheat oven to 400 degrees F.

Toss diced plums with brown sugar, melted butter, vanilla extract and cinnamon.

Next, roll out puff pastry on a floured surface and cut into squares.

Brush squares with egg wash.

In the centre of each square of dough, place roughly 2 teaspoons of plum mixture. Transfer dough to a greased baking sheet,

Bake for 20-25 minutes or until dough is golden.