Blend yeast flakes, parsley, onion, garlic, celery seed, and dill together in a blender until mixture is a fine powder.
Store in an airtight container at room temperature for up to 1 year.
Use about 1 tablespoon of broth powder per 1 cup of water to make broth. Use 1 teaspoon per serving as an accent flavor in a main dish.
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