1 1/4 cups reduced-sodium chicken broth (10 fluid ounces)
1 (14- to 15-ounce) can stewed tomatoes
4 dried New Mexican or guajillo chiles, stems and seeds discarded and chiles torn into pieces
1 (3/4-inch-thick) crosswise slice of a medium white onion
2 garlic cloves, peeled
1/2 cup coarsely chopped fresh cilantro
1/4 cup dry-roasted peanuts
1 teaspoon ground cumin
1/4 teaspoon salt, or to taste
2 tablespoons olive oil
1 rotisserie-cooked chicken (2 pounds)
1 (15-ounce) can pink beans in sauce (preferably Goya)
Garnish: chopped fresh cilantro; sour cream