Preheat the oven to 200C/400F/Gas 6.
For the pastry, lightly oil a muffin tin. Press one filo square into the tin, then brush it lightly with beaten egg and place the next square on top. Repeat with all of the filo squares.
For the filling, place all of the ingredients into a bowl, reserving some chopped chives for the garnish, and mix well.
Pour the filling mixture into the pastry case, transfer to the oven and bake for 10-12 minutes, or until golden-brown.
To serve, place the quiche onto a small plate and sprinkle the chives over.