From the Cooking for your Family board on Babycenter:
Katie (Katiedid) from Taste of Home 2007
1/2 c milk
1/2 c dry bread crumbs
2 envelopes brown gravy mix, divided
2 tsp dried minced onion
1 lb lean ground beef
1 c water
2 T prepared mustard
In a bowl, whisk the eggs and milk. Add bread crumbs, 2 T gravy mix and onion. Crumble beef over mixture and mix well. Shape into six patties about 3/4 in. thick. Broil 3-4 in. from the heat for 6-7 minutes on each side or until meat is no longer pink and a meat thermometer reads 160. Place remaining gravy mix in a small saucepan; stir in the water and mustard. Bring to a boil; cook and stir until thickened. Serve the gravy over the beef patties.
These were very delicious!