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Export 13 ingredients for grocery delivery
Place mushrooms, onion, bell pepper, kielbasa, garlic, cumin, paprika, thyme, salt and pepper in a 5- to 6-quart slow-cooker; stir in broth. Cover and cook on Low for 6 to 7 hours or High for 3 to 4 hours. Stir in spinach; cover and cook until wilted, 15 to 20 minutes more. Add butter (or oil) and vinegar to taste. Stir to incorporate.