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Swiss Chard and Sweet Potato Gratin

Yields1 Serving

 canola or olive oil, for cooking
 1 small onion, finely chopped
 2 bunches of Swiss chard, leaves and stems separated and both cut into 1-inch pieces
 2 Tbsp. butter
 2 Tbsp. flour
 2 cups milk
 2 garlic cloves, minced
 1 large dark-fleshed sweet potato, peeled and cut into 1/8-inch thick slices
 light sprinkle of freshly grated nutmeg
 salt & pepper
 1 cup coarsely grated Gruyére, old cheddar or Gouda cheese

Heat a drizzle of oil in a heavy skillet set over medium-high heat and cook the onions for a few minutes. Add the chard (if you rinse the leaves first, they should have an ideal amount of moisture still clinging to them) and sprinkle with a bit of salt and cook until the chard wilts and there is no moisture left in the pan. Transfer to a bowl.


Add the butter and flour to the skillet and whisk together to make a paste. Whisk in the milk, then add the garlic and bring to a simmer. Boil for 2 minutes, whisking; season with salt and pepper and remove from the heat.


Preheat oven to 400°F. Spray a baking dish with nonstick spray. Spread half of the sweet potatoes in the baking dish. Sprinkle with nutmeg, salt, pepper, half of the greens mixture, about half the cheese and half the sauce. Layer with the rest of the potatoes, the rest of the greens, the rest of the sauce, and top it all with the rest of the cheese.


Cover with foil and bake for about 45 minutes, then take the foil off and bake for another 15 minutes, until golden and bubbly. Let stand 15 minutes before serving.