- Measure 1 tablespoon [2 TBL] tortilla soup base for the honey-lime yogurt; set the rest aside for the soup.
In a small bowl, stir together the honey-lime yogurt with 1 tablespoon [2 TBL] tortilla soup base. Season to taste with salt and pepper.
In the same pot used for the chicken, add the coarsely chopped onion, season with salt and pepper, and cook over medium-high heat, stirring occasionally, until starting to soften, 2 to 3 minutes. Add the chicken and any accumulated juices, the black beans, the remaining tortilla soup base, and 1 cup [2 cups] water and season with salt and pepper. Bring to a boil, then reduce to a simmer, cover, and cook, stirring occasionally, until the chicken is cooked through, 5 to 7 minutes.
Remove from the heat. Using a slotted spoon or tongs, transfer the chicken to a plate to cool, then using a fork, shred the chicken into 1-inch strips. Return the chicken to the pot and season to taste with salt and pepper.