How to Make It
Combine first 4 ingredients; set aside.
Steam green beans, covered, 5 minutes or until tender. Keep warm. Melt butter in a Dutch oven over medium heat. Add shallots; sauté 3 minutes. Stir in mustard mixture and green beans; toss well. Cook for 2 minutes or until thoroughly heated. Stir in sour cream, and remove from heat. Serve immediately.