
Few dishes capture the soul of Spanish home cooking quite like this thick, golden egg-and-potato cake. The technique is simple but satisfying — sliced Yukon Golds and sweet onion are slowly coaxed in olive oil until meltingly tender, then folded into beaten eggs and cooked into something far greater than the sum of its parts. The flip is the dramatic moment every cook secretly loves, and that confident invert reveals a beautifully set, lightly golden exterior with a custardy, just-barely-set center. Every ingredient here is straightforward and naturally free from tree nuts of any kind, so there's no label-scanning or substitution gymnastics required. It's the kind of recipe that works equally well as a casual weeknight dinner, a brunch centerpiece, or sliced into small wedges for a crowd. A scatter of fresh parsley at the end adds a little color and brightness, though the tortilla is honestly stunning without it. Serve it warm, serve it at room temperature — either way, it disappears fast.
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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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