First, thaw the puff pastry and softened butter on counter, about 30 minutes.
Pre-heat oven to 350 degrees and line a large cookie sheet with parchment.
In a medium bowl, using a hand mixer, blend together the butter, brown sugar, sugar and cinnamon. Set aside.
Sprinkle surface with flour and layout one sheet of puff pastry. Roll out the pastry dough.
Using a 3 inch round cookie or biscuit cutter, cut out 15 circles. Discard scraps.
Repeat the two previous steps with second sheet of puff pastry.
Layout all the circles and place about 1/4 - 1/2 tsp of cinnamon butter mixture in the middle of each circle.
In a small bowl, beat one egg.
Using a pastry brush, spread egg wash around the edges of the circles.
Fold over the circle and press together. Use a fork to crimp the edges closed.
Place all the crescents on the parchment lined cookie sheet.
Brush the tops with the egg wash.
Bake for 12 - 15 minutes.
Let cool.
If desired, mix the powdered sugar and milk in a small bowl, and drizzle over tops of crescents.
Enjoy!