I have made these with both almonds and pecans and they turned out so good. I have also made them using sugar and brown sugar with the same ratios and they are great, I just decided to make up this particular recipe because I have several members in my family that are diabetic and it didn't seem fair that they didn't get to enjoy my Christmas goodies!
In a large bowl or large heavy duty freezer bag, thoroughly mix together sugars, cinnamon, and salt. Set aside. In a medium sized bowl, combine egg whites and vanilla and whisk together until it starts to get frothy and bubbly. Add nuts and toss until well coated. Then pour mixture into dry mix and toss until well combined.
Spray inside of crockpot with Pam and add nut mixture. Turn setting to low (note- if your crockpot cooks at a higher temperature, you may want to use the warm setting, I have two crockpots and they each cook differently!).
Cook with the lid on 3-4 hours, stirring every 20-30 minutes. If your crockpot cooks at a higher temperature, it may cook faster so keep an eye on it and use your nose to make sure it doesn't burn! In the last hour, add the water and stir very well. Continue stirring every 15 minutes for at least 45 minutes to ensure they are well coated. Line a baking sheet with parchment paper and spread the mixture flat to cool and harden. Make sure there are not large clumps. Once they harden, break apart and store in an airtight container. Enjoy!