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Deb,
  You asked about 1/4 cup of dried onion in an herb muffin recipe.
I would guess that they are referring to dried onion flakes, which
are considerably more bulky than onion powder.  I personally would
find 1/4 cup of the stuff to be overkill, and would start with one
tablespoon or so and then use more if it seemed totally awesome :-)
There are 4 Tbsp in 1/4 cup, so this would be one-quarter of the
suggested quantity.

Muriel Kranowski <[log in to unmask]>