Heat the olive oil in a saucepan and briefly toast the oat flakes so that they can develop their aroma. Deglaze with the vegetable stock and milk and add the sea salt. Bring everything to the boil once and simmer on medium level for about 2 - 3 minutes. Take the saucepan off the heat, stir in the spinach and let the porridge soak for 10 minutes to the end (during this time the porridge will be nice and creamy). Season with salt, pepper and nutmeg and fill in 4 bowls.