Savory recipes may call for onion salt or onion powder to add a touch of onion flavor to casseroles, breads and meat entrees. Because onion salt is a mixture of onion powder and salt, you can easily substitute onion powder for onion salt with minor adjustments to the recipe to make up for the difference. The finished result should be essentially the same when you perform the conversion properly.
Check the recipe to determine the amount of onion salt required.
Measure 1/4 tsp. onion powder for every teaspoon of onion salt required in the recipe.
Add 3/4 tsp. of table salt for every 1/4 tsps of onion powder you add to equal 1 tsp. of onion salt. For example, if the recipe calls for 2 tsp. onion salt, add 1/2 tsp. onion powder and 1 1/2 tsp. salt.