Place 1 cup instant nonfat dry milk in a 1-liter mason jar with a tight-fitting lid.
@BstKidEva Add cornstarch, bouillon powder, minced onion, parsley, and pepper. Screw the lid on and shake until evenly combined.
Add remaining cup dry milk. Screw the lid back on and shake again. Store in a cool, dark pantry until ready to use.