Spray the cooking pan of your slow cooker with non-stick spray.
In a small bowl, mix together brown sugar, white sugar, cinnamon, an chili powder.
Add nuts to the slow cooker and sprinkle the sugar and spices over them.
Add water and stir until fully combined.
Place a paper towel over the top of the slow cooker pot and then place the lid on it.
Set the slow cooker to LOW and cook for 3 hours stirring every 30 minutes or HIGH for 1 hour stirring every 30 minutes.
When the cook time is up remove the nuts from the slow cooker and spread them out in a single layer on a lined baking sheet. Let the nuts cool completely.
Store in an airtight container until ready to serve.