This simple, fast tortilla is perfect for satisfying cheesy cravings and works as an ideal lunch or light dinner. Top it with crispy onions and melted Gruyère.
Thinly slice the onion and gently fry it in a generous amount of oil with a pinch of salt in a pan for about 20 minutes.
Preheat the oven to 200 °C/180 °C with convection/gas 6. Lay 2 tortillas on a baking sheet and spread the Gruyère between them. Place the other tortilla on each, then the onion. Halve the olives and scatter them on top together with the anchovies. Sprinkle the remaining Gruyère and bake for 5‑10 minutes until a crisp crust forms.
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