I mix my own too but it cakes up on me. I was thinking of adding rice to absorb the moisture. Anyone else have this problem?
I see 3 links to spice blend recipes in this thread.
2 of the recipes contain garlic powder.
This is probably what is causing your mix to "cake up"
Garlic powder is a magnet for moisture which causes the caking.
Swap the garlic powder for granulated garlic.
The two items are virtually identical in taste and potency as well.
The powder resembles flour and the granulated garlic is similar in texture to ground black pepper.
As well never store spices over the stove, convenient maybe, but there is just to much moisture hitting that over-the-stove cabinet.
Also never shake spices from the jar directly into your "cooking pot".
Steam rising from the pot will get into the spice jar and cause caking and shorten the life span of your spices as well.
If you still have caking problems after switching to granulated garlic and verifying that your storage area is cool and very dry, you can try and use a little baking soda or potato starch in the mix as a natural anti-caking agent. Just a couple of pinches to start out and adjust as needed.
Good Luck