1. Whisk together first 6 ingredients in a small bowl until well blended.
2. Prepare green beans according to package directions. Toss green beans with desired amount of dressing.
*1 (12-oz.) package frozen cut green beans may be substituted. For testing purposes only, we used Birds Eye Steamfresh Fresh Frozen Cut Green Beans.
Kitchen Express: Omit olive oil, vinegar, and next 3 ingredients. Stir together mustard and 1/2 cup bottled balsamic vinaigrette. Proceed with recipe as directed in Step 2.