Slow cooker butter chicken (a. k. a. chicken makhani) is easily made by simmering chicken in a velvety, tomato-tinged, indian-spiced cream sauce in the crock pot. this rich and decadent dish can be prepped in mere minutes and is packed with authentic flavors and everyday ingredients that can be found in most grocery stores; then you simply set it and forget it while it cooks low and slow.