Brown chicken, transfer to slow cooker.
Fry onion garlic, paprika, salt, pepper over medium heat, until onion is softened, about 5 minutes. Add tomatoes, bring to boil, scraping up brown bits from skillet. Scrape into slow cooker and stir to combine.
Cook until juices run clear, about 4 hours on low. Skim fat, add tomato paste and green pepper to slow cooker. Cook until thickened, about 15 minutes.
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