INGREDIENTS
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 1/4 red onion, thinly sliced
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Kosher salt
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 1/4 head of savoy cabbage, cored, thinly sliced
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3 tablespoons white wine vinegar
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4 tablespoons (or more) olive oil, divided
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Freshly ground black pepper
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4 skinless, boneless chicken thighs
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 1/4 cup cornstarch
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2 large eggs
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2 tablespoons Dijon mustard
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1 teaspoon cayenne pepper
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2 cups panko (Japanese breadcrumbs)
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cup mayonnaise
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8 slices white Pullman bread, toasted