Spray the slow cooker with nonstick cooking spray.
Cube your butter and Velveeta.
Add all of the ingredients to the crock pot. Stir to incorporate all of the ingredients, making sure all of the noodles are damp.
Cover the slow cooker and cook on low for 1.5 - 2 hours. Stir it a few times throughout the cooking time to keep the Velveeta and butter distributed as it melts.
Test the noodles at 1.5 hours, and if they are not al dente, then continue to check on them in another 30 minutes.