Preheat crock pot on high for 15 minutes. In preheated crock pot, stir the nuts and butter until mixed well. Add the powdered sugar, stirring to coat evenly. Cover and slow-cook on high for 15 minutes. Reduce the heat to low and slow cook, uncovered, stirring occasionally, until the nuts are coated with a crisp glaze (about 2 hours). Transfer the nuts to a bowl. In another small bowl, combine the spices and sift them over the nuts, stirring to coat evenly. Let cool before serving.