Melt butter in a large sauté pan or cast iron skillet over medium heat.
Sauté garlic in butter for 60-90 seconds - be sure it doesn't burn!
Add cleaned fresh green beans to the pan and with tongs coat the beans with the butter and garlic.
Add mustard, salt, and onion powder and with tongs coat green beans well. Then add vinegar and let cook for 3-4 minutes.
Add stock and then cover pan with lid and let cook for 4-5 minutes.
Remove lid, stir beans, and serve!
Notes
Use whatever stock you have: Vegetable, Chicken, or Beef.Fresh green beans are best, but if you do use frozen, be sure to get beans labeled whole or haricot vert.