
Few dishes are as quietly impressive as this classic Spanish egg and potato cake — golden on the outside, silky and just barely set in the center. The magic comes from slowly cooking the potatoes and onion in a generous pour of extra virgin olive oil until they're meltingly tender, then folding them into beaten eggs for a rich, custardy result that needs absolutely nothing else to shine. Because the entire recipe is built on eggs, potatoes, onion, and olive oil, it's naturally free of any dairy without a single substitution or workaround — no butter, no cream, no cheese anywhere in sight. The flip is the moment that separates a good tortilla from a great one, and the instructions walk you through it with enough confidence that even first-timers can nail it. Serve it warm straight from the skillet or let it cool to room temperature, where the flavors actually deepen and the texture becomes even more satisfying. A scatter of fresh parsley adds a bright finish, but honestly, a clean wedge on its own is already something special. This is the kind of recipe that earns a permanent spot in your rotation.
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Heat the olive oil in a 10-inch nonstick skillet over medium-low heat until it shimmers. Add the potato slices and onion, season with ½ tsp of the salt, and stir gently to coat. Cook, turning the potatoes occasionally with a slotted spoon, until the potatoes are completely tender and yield easily when pressed with the back of a spoon, about 20–25 minutes. They should be soft but not browned.
Use a slotted spoon to transfer the potatoes and onion to a large mixing bowl, leaving as much oil behind in the skillet as possible. Reserve 2 tbsp of the cooking oil in the skillet and discard the rest (or save for another use).
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