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In a large soup pot or Dutch oven, cook the bacon over medium heat until cooked, but not crisp (about 5 minutes).
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Add the onion and garlic; cook, stirring, until softened (about 5 minutes).
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Add the potatoes and chicken broth; simmer until the potatoes are just tender (about 15 minutes).
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Meanwhile, pull the meat off the rotisserie chicken, discarding skin and bones.
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Add the chicken and white beans to the stew; cook until heated through.
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Just before serving, stir in the arugula and season to taste with salt and freshly ground black pepper.