Melt the butter in a large pot over medium heat.
Add in the onions, zucchini, turnips, carrots and celery, and stir to combine.
Saute until the vegetables begin to soften.
Add the chili powder, cumin, oregano, paprika and salt and pepper to taste.
Mix in the garlic, and saute another 30 seconds.
Squeeze in the lime juice.
Pour the tomatoes and chicken broth into the pot.
Cover and simmer for about 15 minutes, or until the turnips are tender.
Stir in the chicken, and simmer until warmed through.
Garnish with cilantro, jalapeno slices and lime wedges before serving.