Prick the tortilla in the center. Once you see it rise again, it’s done and fully cooked. If your finger makes an indentation, give the tortilla a little more time.
how to serve
Cut your tortilla like a sliced cake. This classic Spanish breakfast is usually served plain. Give it a splash of hot sauce for an extra kick. If you want variety, the Spanish tortilla, served with anything, is enjoyed with a simple green salad like these:

storage instructions
Transfer the tortilla to an airtight container and store in the refrigerator for up to 3 days. Make sure it has completely cooled to room temperature before storing to prevent condensation from forming inside the container.
I do not recommend storing tortilla/Spanish omelette in the freezer. Since it’s predominantly eggs, the texture will be weird and runny once it’s frozen and thawed.

