Thank you all for my 100th win.
Here is how to make sugar crystals.
I found a picture close up sugar on line and made a brush. I'll save you some steps.
Open this image
in Photoshop and go to EDIT/DEFINE BRUSH PRESET.
Call it sugar crystals.
Apply these settings
Find a cookie.
Make sure your background and foreground colors are set to black and white.
Create a new layer and set it to "screen"
Then brush in your sugar.
Add a drop shadow for added realism.
You can also drop the opacity if needed and erase any crystals that look floaty.
Ain't it sweet?