Yes, you can, and it will be amazing! Add your potatoes to a greased slow cooker (for easier clean-up). Cover and cook on high for 2-3 hours or on low for 5ish hours. Check on the potatoes, and when they are fork-tender, add all the ingredients, (except for what is reserved for the top). Use a hand mixer to blend everything together. Top potato mixture with remaining cheese, cover, and continue cooking for about 10 to 15 minutes or until cheese is melted, garnish with extra bacon and green onions and enjoy!