Prepare an ice-water bath. Bring a large pot of salted water to a boil. Working in batches, add green beans, and cook until bright green and tender, about 3 minutes. Using a slotted spoon, transfer green beans to ice-water bath until well chilled, then drain and pat dry. (Blanched green beans will keep, covered and refrigerated, for up to 1 day.)
Heat oil in a large skillet over medium-high heat. Add shallots and red-pepper flakes, and cook until shallots are tender, 2 to 3 minutes. Add green beans, tossing to coat, and cook until heated through. Season with salt and pepper, and serve immediately.
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