Spanish spinach omelette

Good breakfast! But time is spending. I fried potato and onion separately each other. Next I put all in one heat-resistant cookware and poured everything with a mixture of 6 medium size eggs and 150-200 ml milk. I cooked it in an oven for 30 min and at 160°C. For the crust I placed cookware on the top shelf in the oven for a minute. Ready!