Serve this tasty slow cooker fiesta chicken with spanish or mexican rice and sour cream or guacamole. You can use chicken breasts or thighs for this recipe. Try searing the chicken in about 1 tablespoon of olive oil before placing it into the slow cooker. While searing does add some extra flavor, it isn't a necessary step. Feel free to use fire-roasted or chili-style tomatoes if you'd like