Roll out puff pastry into a rectangle, about ¼" thick. (Store bought pastry just needs a light-handed roll to smooth cracks.)
Slice apple as thick or thin as you please.
Use a fork to stir together cream cheese, 2 T. brown sugar, 1 egg yolk, vanilla, lemon zest, and cinnamon until relatively smooth.
Slice pastry into rectangles, approximately 3x4" big.
Dallop a generous tablespoonful of cheese mixture into the center of each pastry and top with apple slices.
If you like, brush egg white over edges of pastry to make them gleam.
Sprinkle pastry filling & apples with brown sugar.
Using a knife, lightly score the pastries, making a small rectangle around the edge of the filling. This will make the edges puff up and keep the filling inside, rather than oozing out.
Bake 15-20 minutes, or until pastries are golden brown. Serve with hot drinks & enjoy!
Recipe by Jellibean Journals at https://jellibeanjournals.com/apple-cheesecake-breakfast-tarts/