Next you must prepare to place your layers in the slow cooker. Prepare your potatoes, kale, onions, cauliflower and cheese in bowls or on plates near your slow cooker. First you are going to add a layer of sliced potatoes. Use about half of them. Next sprinkle half of your kale, then half of your cauliflower and then half of your onion. Pour half of alfredo mixture, as evenly as possible, over top of the onion layer. Now sprinkle half of your cheese all over the top of the sauce. Then place all of your remaining potatoes on top of the cheese. Next, the remaining kale, cauliflower and then onion. Pour remaining sauce all over and sprinkle the rest of your cheese all over the top of the sauce.