In salted water cook pasta 1 minute under package instructions. Usually about 8 minutes. Drain
In a sauce pan melt butter over medium heat, add in 4 cups of cheese, heavy cream and salt & pepper. Stir continuously until melted, about 2 to 3 minutes.
Pre-heat oven to 350 degrees. Spray or butter 9 x 13 baking dish. Pour noodles in baking dish and pour sauce over and stir to combine.
In a bowl mix 2 cups of cheese and panko crumbs to combine. Sprinkle evenly over the macaroni mixture. Bake for 20 to 30 minutes until bubbly and golden on top.