Every time I have garlic powder around, it always ends up forming into a hard sticky lump. Is there any way to reconstitute this into a usable form? Placing it in warm water seems to take forever and it never really dissolves.
You should make a beurre monte.
You need 4 tablespoons of water, and 1/2 cup of cubed butter (about 1 tablespoon per cube).
Bring the water to a boil and just as it does reduce the heat to a low-medium temperature, and start whisking in the butter cubes, whisk constantly and add the cubes one at a time.
Once you see the butter start to emulsify add in 4 tablespoons of the garlic powder, and continue adding butter until the entire 1/2 cup of cubed butter is used)
Strain the mixture through wet cheesecloth into a bowl. Now you have garlic infused beurre monte.
Use it how need after that - it will be very strongly flavoured, use it sparingly. You can refrigerate it if you like, if it looses the emulsification just soak up the water with some paper towels.