Heat A Large Skillet Over Medium-High Heat; Stir In The Ground Beef, Chicken Bouillon, Garlic Powder, Black Pepper, And Onion Powder. Cook And Stir Until The Beef Is Crumbly, Evenly Browned, And No Longer Pink, About 7 Minutes. Stir In The Flour And Cook For 3 Minutes, Stirring Constantly. Stir In The Milk And Bring To A Simmer, Stirring Constantly. Reduce Heat To Medium-Low, And Simmer 5 Minutes To Thicken.