Chorizo and Potato Spanish Tortilla Bites

Regular readers of this blog know that I love all things Spanish. Wine. Food. Everything. Here's an adaptation of the traditional Spanish tortilla (an egg omelet type dish, NOT like the Mexican bread product) that makes a wonderful appetizer.

Chorizo and Potato Spanish Tortilla Bites
From Gourmet magazine.

1 bunch scallions
2 tablespoons extra-virgin olive oil
2 medium onions, chopped (1 1/2 cups)
4 garlic cloves, finely chopped
1 1/4 teaspoons salt
1/2 teaspoon black pepper
6 ounces Spanish chorizo (cured spiced pork sausage), cut into 1/4-inch dice
1 1/2 lb yellow-fleshed potatoes such as Yukon Gold (about 4 medium), peeled and cut into 1/4-inch dice
9 large eggs
3/4 cup sour cream
5 oz Manchego cheese, coarsely grated (2 cups)

Put oven rack in middle position and preheat oven to 400°F. Lightly oil a 13- by 9-inch baking pan or dish.

Finely chop white and green parts of scallions and reserve separately. Heat oil in a 12-inch heavy skillet over moderately high heat until hot but not smoking, then cook onions, garlic, white parts of scallions, 3/4 teaspoon salt and 1/4 teaspoon pepper, stirring occasionally, until onions are golden, about 6 minutes. Add chorizo and cook, stirring occasionally, until just beginning to brown and release oil, about 4 minutes. Reduce heat to moderate, then stir in potatoes and cover skillet. Cook, stirring occasionally, until potatoes are tender, about 10 minutes.

Transfer mixture to a large bowl and cool slightly.Whisk together eggs, sour cream, cheese, scallion greens, and remaining 1/2 teaspoon salt and 1/4 teaspoon pepper in a bowl, then pour into baking pan. Sprinkle potato mixture over eggs (some potatoes will stick out).

Bake until custard is set, about 20 minutes. Cool in pan on a rack to warm or room temperature. Trim 1/2 inch off each side, then cut tortilla into 1 1/2- by 1-inch rectangles. Serve on a platter with toothpicks.

Cook's note: Tortilla can be baked 1 day ahead and cooled completely, uncovered, then chilled, covered. Cut into squares, then bring to room temperature before serving or reheat to warm in a preheated 325°F oven.