To make in a slow cooker, brown ground beef and green onion in step 1, and transfer to a slow cooker. Set cooker to High setting and cook for 3 hours. Stir in processed cheese, allow to melt, and thoroughly mix before serving.
As the chili cools, it'll become firm. This is caused by the processed cheese; it will soften up again when warmed.
Try using a liner in your slow cooker for easier cleanup