Onion Powder always hardens to cement in my pantry!
I use quite a bit of onion powder. Enough to run out of it. Now, when I need some, I just grind some dehydrated onion flakes in the mortar pestle. The flakes grind really easily. One less container to store by not buying more. Onion powder is nice in seasoned flour when you dredge meats...that refried beans are my main two uses for it.