Place pastry on clean work surface. Brush edges with water. Fold in edges 1/2 inch to create a border all around. Place pastry on a sheet pan. Top pastry with another sheet pan and bake 20 minutes. Remove top pan and continue to bake 10 minutes or until golden brown. Remove from oven and cool.
Spread cooled pastry evenly with yogurt. Arrange fresh fruit over the yogurt and sprinkle with powdered sugar. Cut pastry into squares and serve.