Garlic Powder
Garlic Powder is a dry seasoning used in small amounts for clear aroma and flavor. Add gradually, taste as you go, and refresh it when the smell turns dull.
Identity
Dry spice
Use small amounts and refresh stale jars.
Powdered spices spread quickly through a dish. Add a little at a time, bloom in fat when the recipe calls for it, and replace the jar when the aroma turns flat.
Wikimedia Commons
Reference image
Garlic Powder reference image.

Source: Wikimedia Commons
Used In Recipes
Substitutions
Acceptable
Black Pepper -> Garlic Powder
Optional spices: freshly ground black pepper, cayenne pepper and/or garlic powder
The source lists this as an alternative in the same ingredient row.
Source: Crispy Baked Sweet Potato Fries