1. Warm oil in a large, deep skillet over medium heat. When hot, add the garlic and cook, stirring 1 minute or until garlic is fragrant. Add the red bell pepper and onion; cook, stirring, 2 minutes.
2. Add the broccoli coleslaw, salt, black pepper, and vinegar. Cook, stirring 4-5 minutes or until the slaw is tender but not mushy.
3. Transfer mixture to a serving bowl, and sprinkle with grated cheese, if desired. Can be served warm or cold.