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Cook the elbow noodles according to package directions. Drain under cold water.
In a medium bowl, whisk together the mayonnaise, sour cream, vinegar, sugar, relish, mustard, salt, and pepper. Mix in freshly chopped herbs, if desired.
In a large bowl, add the noodles, bell pepper, celery, and onion. Drizzle the dressing over the top and toss until well combined. Chill until ready to serve.