Spanish Tortilla

from Romancing the Stove (adapted from Real Simple magazine)

2 tablespoons olive oil
2 russet potatoes (approx. 1 pound), peeled, cut into 1/4-inch-thick half-moons
1 onion, thinly sliced
salt and black pepper
8 large eggs, beaten

Preheat oven to 350° F. Heat the oil in an ovenproof nonstick skillet over medium heat. Add the potatoes and cook, stirring occasionally, until almost tender, 8 to 10 minutes. Add the onion, 1 teaspoon salt, and 1/4 teaspoon pepper and cook, stirring occasionally, until the onion is soft and the potatoes are tender, about 5 minutes.
Pour the eggs over the potatoes; stir to distribute the ingredients. Transfer the skillet to oven and bake until brown around the edges and a knife inserted into the center comes out clean, 15-20 minutes. Serve hot or at room temperature, sliced into wedges.

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