1 tablespoon olive oil
1 shallot, finely chopped
1/8 teaspoon red pepper flakes
2 bunches Swiss chard, rinsed well
1 tablespoon apple cider vinegar
1/2 teaspoon salt
Cut off and discard chard stems and any tough center ribs. Thinly slice leaves. Set aside.
Heat oil in a large skillet over medium high heat. Add shallot and pepper flakes and cook, stirring often, until softened, about 2 minutes. Add chard, vinegar and salt and continue cooking, tossing often, until wilted and softened, 3 to 4 minutes more.
Or, to cook in the microwave, place shallot, oil and pepper flakes in a very large microwavable bowl. Microwave on high until shallot is soft, about 1 minute. Add chard, vinegar and salt and toss. Microwave on high, stopping to stir every minute or so, until chard is wilted and soft, about 6 minutes. Pour off any excess liquid before serving.