Stir the onion flakes, beef bouillon granules, onion powder, parsley flakes, celery seed, paprika, and black pepper in a bowl. Use as substitute for a 1-ounce envelope of dry onion soup mix.
To make this into soup, bring 3 1/2 cups water to a boil in a medium saucepan. Whisk in soup mix, reduce heat to low, and simmer for 5 minutes.
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