Cook the spinach. Pressure cook the spinach for 1 whistle. Chop it and drain off the excess water.
Make the filling. Add the coriander, green chillies, jeera powder, black pepper, nutmeg, chilli flakes and cashews. Crumble in the feta and mix well.
Make the paste. Mix the flour and water into a smooth paste.
Fold. Fold a triangle at one end of a samosa patti strip, then fold twice more to form a cone. Fill with the stuffing, fold to close and seal with the paste.
Bake. Brush both sides with olive oil. Bake at 200°C for 15 minutes, flip and bake for 15 minutes more.
Serve. Serve the samosas hot.