Add all of the dry ingredients to a pan on medium heat, and keep stirring until well toasted (the color will change to a deep brown). You almost want this to burn, but obviously not quite.
Slowly add vegetable broth to the dry ingredients while vigorously whisking to remove any clumps.
On med to low heat, continue whisking while the gravy simmers until it thickens to desired consistency.
Notes
You can substitute fresh onion, garlic, and herbs instead of using dried. Simply double the amounts, mince fine in a food processor, and add to wet ingredients mixture instead. The Nutritional Information detailed here assumes you are using a full-strength low sodium broth (the sodium will vary depending on what you are using). You can reduce sodium further by using some or all water instead of vegetable broth (diluting the vegetable broth with water), or your own homemade low or no-sodium vegetable broth if desired.