Preheat oven to 375F Boil macaroni noodles in about 8 cups of water until Al Dente Strain macaroni and set aside Warm quart of half and half on low heat, making sure it doesnt boil In a pot melt stick of butter Pour flour into melted butter whisking constantly Once the flour and butter is smooth, add warm half and half Continue whisking until thickened Remove from heat and add salt & pepper Stir in 2 cups of sharp cheddar and 1 cup of mild cheddar Combine macaroni with the roux Transfer to baking dish Sprinkle the remaining cup of cheddar over the top Bake for 20-25 minutes until bubbly and top is slightly browned Serve while hot and enjoy!