Sweet potato crust quiche | Healthy Spinach Quiche

sweet potatoes (medium size orange, peeled, finely sliced)

olive oil

garlic clove (finely chopped)

large brown onion (finely chopped)

frozen blanched whole leaves spinach ((400 g))

ground pepper (optional)

salt

eggs

coconut milk or almond milk (or milk of your choice (200 ml))

ground nutmeg

grated cheese (edam, cheddar, feta)