This is from allrecipes.com. I LOVE this stuff but my son does not so I don't make it as often as I'd like to.
1 lb ground beef
1/2 cup flour
2 cups milk (add another 1/4 cup if you need to, depending on how thick you like it)
1 tsp salt
1 tsp beef bouillon granules
1/4 tsp Worcestershire sauce
Brown ground beef and drain. Add flour and stir well. Cook over medium heat until flour is all absorbed. Add remaining ingredients. Stir and bring to a boil. Lower heat and allow to simmer for about 5 minutes. Serve over biscuits.