Out of all of the cooking tools in the kitchen, there’s one pan we just wouldn’t be able to live without: the sheet pan. It’s the most important pan in the kitchen. Everyone has a humble sheet pan, and we’re finding new ways to put it to work. Our friend Wendy Paul shares a sheet pan lasagna. It's a classic casserole makeover that will change the way you make lasagna forever. It uses similar ingredients, but cuts the layering time in half.