3lbswaxy gold potatoes, skin on, sliced ½-inch thick
1lbleeks, light green and white parts only, sliced ½-inch thick and rinsed very, very well under cold water
Preheat oven to 400 degrees. Coat a 4-quart baking dish with nonstick spray.
In a large bowl, combine all ingredients and stir until evenly coated. Pour into prepared casserole. Sprinkle a little extra Parmesan on top. Bake on top of a sheet tray to catch any cream that may bubble over.
Cover and bake 20 minutes. Remove cover and bake 20 more minutes until bubbly and slightly browned. Serve with beef and enjoy!