Add in your onions and saute until caramelised. Stirring frequently to prevent burning.
Mix in your garlic. chilli flakes and thyme and cook for 1 minute.
Add your chopped spinach on top and cover your pan with a lid. Cook for 6-10 minutes or until your spinach has wilted.
Continue cooking until most of the water has been cooked off.
Take off heat and mix in your nutritional yeast. Allow mixture to cool.
Preheat your oven to 220C/200C fan.
Flour your clean workspace with some flour. And divide your pre-rolled puff pastry into 6 squares.
Add your spinach and caramelised onion mixture on one-half of your pastry squares. Fold over and with a floured fork seal the edges together and create 2-3 slits on top for air to escape.
Refrigerate for 10 minutes.
Combine your 1 tbsp of olive oil, nutmeg and black pepper. Glaze over your puff pastry.
Bake for 30-35 minutes or until puffed and golden.