Heat the oil in a large saucepan until shimmering. Add the onion, 1 tablespoon of the minced garlic and a pinch of crushed red pepper. Cook over moderately high heat, stirring frequently, until the onion is softened, about 6 minutes. Add the stock, Swiss chard and beans and bring to a boil. Reduce the heat to moderately low and simmer until the chard is tender and the soup is slightly thickened, about 15 minutes.
Add the chicken and the remaining 1/2 tablespoon of garlic and simmer gently over moderately low heat until the chicken is just cooked through, about 5 minutes. Season with salt and pepper. Ladle the soup into bowls and serve.
The soup can be refrigerated for up to 1 day.
A refreshing Spanish white, such as a Rioja, will echo the slightly bitter Swiss chard.
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