I have more than just a recipe on how to make onion powder from scratch, check out these links below:
Cajun Seasoning Recipe
Old Bay Seasoning Recipe
Homemade Garlic Powder
Do you want to learn how to make homemade onion powder from scratch? So easy to make and
makes a good dish even better. If you want to SAVE MONEY and have great
tasting food - you must check out my homemade recipe.

How to Make Onion Powder:
Chop the amount of onion you want to dry, then spread evenly on a baking sheet and place in a 150 degree oven. Of course, a food dehydrator is perfect for this. The onions are dry and ready when you can easily crumble them in your hand.
Allow to cool and then grind in a food processor, mortar and pestle, spice mill or coffee grinder until you reach the desired consistency your looking for.
Store in an airtight container in a cool and dry place, or freeze for long-time storage.
PASTA SAUCE WITH SPARE RIBS
2 TBS oil
2 lbs pork spare ribs, cut into serving pieces
1 medium onion, chopped
2 garlic cloves, minced
1/2 tsp
homemade garlic powder
1/2 tsp homemade onion powder, above
1 can (28 oz) plum tomatoes
6 oz homemade tomato paste
3/4 cup water
1 tsp salt
1/2 tsp oregano
Heat oil in large pan over medium-high and brown the spare ribs. Add
chopped onion, onion powder, garlic powder, garlic powder and cook.
Stir often until the onion is transparent.
Add the tomatoes, crushing them in your hand with juice. Add remaining ingredients and bring to a boil. Reduce heat and simmer for 2 hours, or until meat starts to fall away from the bone. Stir often while simmering.
This can be made ahead of time and frozen for a future occasion.
How To Make Garlic Powder
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