Dice the onion and sauté in the oil. Add the vegetable stock and the millet rinsed in a sieve, bring to the boil briefly and leave everything to soak on the switched off hotplate for about 20 minutes. Mix the thawed spinach with the millet and pour into a greased baking dish.
Whisk the cream and eggs, season and pour over. Sprinkle the cheese on top and bake everything at 180 ° C for about 30 minutes.
Tip: You can also replace half of the cream with milk.