Creating these scrumptious crab puffs is a straightforward process. Follow the step-by-step instructions below to achieve culinary success:

1. Preheat and Prepare:
   Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper to prevent sticking and ensure even baking.
2. Whisk the Egg:
   In a small bowl, whisk the egg thoroughly to create an egg wash that will give your crab puffs a beautiful golden-brown finish.
3. Roll Out the Pastry:
   Roll out the thawed puff pastry dough on a lightly floured surface. Cut it into 16 equal squares. This will form the base of your crab puffs.
4. Mix the Filling:
   In a mixing bowl, combine the drained crab meat, light cream cheese, lemon juice, garlic powder, salt, pepper, and half of the chopped green onions. Mix until the ingredients are well incorporated, forming a creamy and flavorful filling.
5. Fill and Fold:
   Spoon about 2 tablespoons of the crab filling onto each pastry square. Gently fold the edges over to enclose the filling, creating a neat pocket.
6. Brush and Bake:
   Brush the tops of each filled pastry with the egg wash. This step ensures a shiny and appetizing finish. Place the crab puffs on the prepared baking sheet.
7. Bake to Perfection:
   Bake in the preheated oven for approximately 20 minutes, or until the puffs are golden brown and the pastry is cooked through.
8. Serve and Enjoy:
   Once baked, allow the crab puffs to cool slightly. Serve them warm and savor the delightful blend of flavors and textures.