You can make this dip in an oven at 325 degrees, covered for 1 hour. To prepare it in a slow cooker set to medium-high heat and place the vegetables in for 20 minutes with 2 T. butter. Cook 20 minutes to wilt the veggies. Then add the remaining ingredients and cook 20 minutes or until the cheese is melted. Turn the slow cooker down to low and add water to thin as needed.