"Perfectly cooked chicken with a big pile of caramelized onions makes an ideal chicken melt sandwich...."
INGREDIENTS
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4 teaspoons vegetable oil
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2 boneless, skinless chicken breasts, about 1 pound (450g), sliced lengthwise into 4 flat 1⁄2-inch-thick (1.3cm-thick) pieces
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1 teaspoon kosher salt
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1⁄2 yellow onion, sliced
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1 teaspoon distilled white vinegar
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1⁄2 red onion, thinly sliced
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1⁄2 bunch scallions, white and green parts, thinly sliced
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2 tablespoons fried shallots (store-bought is totally great)
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3 tablespoons salted butter
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4 slices rye bread
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4 slices good melting cheese, such as Colby Jack or Muenster