1. Preheat your oven, fan-assisted, to 180°C. Bring a large saucepan of salted water to the boil. Blanch the spinach in it for 3 minutes and remove it in iced water to stop the cooking and fix the chlorophyll. Drain and press firmly to extract all the water. You should have 125g of cooked spinach.
2. In a blender, add the spinach, eggs, parmesan, virgin pistachio oil and de-oiled pistachio powder. Mix until smooth. Transfer to a salad bowl. Then add the baking powder and sifted flour and mix with a whisk. Dilute with the milk in two batches. Season with salt and pepper. Set aside.
3. Roughly crush the unsalted pistachios. Set aside.
4. Pour your muffin mixture into your molds halfway. Add the crushed pistachios and bake for 14 minutes.
5. Serve hot or cold. For the more gourmet, add grated parmesan and a dash of virgin pistachio oil when ready to eat.