It’s important not to overbake the lasagna. Once the sauce starts bubbling around the edges, turn the oven to broil. If your lasagna pan is not broiler-safe, brown the lasagna at 500 degrees for about 10 minutes. Whole milk is best in the sauce, but skim and low-fat milk also work. Supermarket-brand cheeses work fine in this recipe. The Gorgonzola may be omitted, but the flavor of the lasagna won’t be as complex. The test kitchen prefers the flavor and texture of Barilla no-boil noodles, but this recipe will work with most brands. One box of Barilla will yield enough noodles for this recipe; you may need two boxes of other brands.