Mix together cream cheese, mascarpone cheese, lemon juice, and powdered sugar until smooth. Set aside.

Unroll your puff pastry and make ½-inch wide diagonal cuts on the “wings” of it all the way up.

Spread your cheese mixture in the middle, and top with blueberries.

Fold the bottom center flap up over your filling, then fold up each piece to braid your pastry, alternating sides as you go.

Brush with melted butter, then bake at 350 degrees for 20 minutes or until pastry is a fluffy golden brown.

Set out to cool, cut into slices, and serve.