Spray slow-cooker crock with oil.
Cut chicken into 1-2" chunks.
Layer onion, carrot and pepper at bottom of crock, followed by corn, beans, chicken, and zucchini. Combine seasonings, tomatoes, and broth. Pour over rest of ingredients in slow-cooker.
Cook on low setting for 6 to 8 hours. Cook rice and combine in slow-cooker during last hour of cooking.
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