Preheat the oven to 350 degrees F.
In a medium bowl, mix together the cream cheese, powdered sugar, lemon juice, lemon zest, and egg yolk until smooth.
Cut out the inside of the slider buns. Brush the egg wash on the tops of the rolls then sprinkle with granulated sugar.
Fill with the cream cheese mixture. Top with blueberry pie filling and bake for 15 minutes.
