Preheat your convection oven to 425F and line a baking sheet with parchment paper.
Cut off the purple, woodier ends of the asparagus. They should end up being about 6-7 inches in length. See notes below.
Place the trimmed asparagus on a plate and drizzle with the olive oil and sprinkle on the salt. Toss them around to coat evenly. Set aside.
Unroll your thawed piece of puff pastry and place it on the prepared baking sheet. Cut the 10"x10" dough in 4 even squares. See notes.
Cut the wheel of Boursin into 4 equal pieces and place in the center of each Puff Pastry square. Spread into a flat log, diagonally from one corner to another.
On each square, place 5 of the asparagus on top of the Boursin, in the same diagonal direction.
Make an egg wash by whisking the egg and milk with a fork. Use a silicone pastry brush, to spread some egg wash on the 2 empty corners of the squares (left and right from the bundle of asparagus).
Take one corner of the brushed puff pastry, and bring it over the asparagus to hold them together.
Take the other brushed corner of puff pastry, stretch it out slightly. Bring it all the way over to the other side of the wrapped bundle, tucking it under ever so slightly.
Brush the top of each bundle with more egg wash. Sprinkle with some of the Everything Seasoning or sesame seeds and top with grated Mozzarella.
Place in your preheated oven and right away bring the heat down to 400F. Bake for 15-20 minutes, turning them half way through. They will be ready when the puff pastry is nice and golden.