Boil chicken breasts in water til done. Cool and remove meat. Strain broth and reserve.
Chop onion and mince garlic. Saute onion and garlic in butter, over low heat, til soft. Add cumin; stir. Add reserved and canned chicken broth. Add tomatoes, paste, chilies, oregano,chile powder and cilantro. Stir well to melt the paste. Cut chicken into bite size pieces and add to soup. Cook over low heat for 1 hour.