Preheat the oven to 400˚F. Line a few baking sheets with parchment paper.
Add the cream cheese, mayo, salt, black pepper, and granulated sugar into a bowl. Mix until everything is well combined. Gently fold in the corn and mozzarella.
Place the puff pastry sheets onto a cutting board. Follow the seams on each of the pastry sheets and cut 3 strips. Then cut them in half so that you have a total of 12 rectangles (6 rectangles from each sheet).
Use a knife to score a ¼ inch border around the edge, making sure to not cut all the way through. Then prick the center of the rectangles with a fork. Fill them with about 2 tablespoons of the corn filling.
Use a pastry brush to coat the edges of the pastries with the egg wash. Sprinkle the sesame seeds around the edges of the pastries. Bake them for 16-18 minutes until golden brown and flaky. Garnish with a sprinkle of chives on top and enjoy!