No problem! You can make your own substitutes at home with this gravy recipe. For brown gravy mix, combine 1 tablespoon of cornstarch, 1 tablespoon of beef bouillon, and 1/2 teaspoon of onion powder. For the beefy onion soup mix, combine 1 tablespoon of beef bouillon, 1 tablespoon of dried minced onion, 1/4 teaspoon of onion powder, and a pinch of black pepper.