Add garlic and cook 1 min; stir in spinach to wilt.
Mix cooled spinach with cheeses, nutmeg, herbs, salt, and pepper.
Cut puff pastry into squares or triangles.
Add a spoon of filling; fold and seal edges with a fork.
Brush tops with egg wash.
Bake at 400°F (200°C) for 15–20 min until golden.
Cool slightly and serve warm.
Notes
You can customize the herbs, cheese, or even the filling (like adding mushrooms or sun-dried tomatoes). Chill time helps achieve a better puff, but it's optional.