Tomato sauce takes a back seat in this chicken lasagna made with three cheeses, a new star among your Italian food recipes. Instead, mascarpone and Parmigiano Reggiano blend into a silky sauce to make a stunning cauliflower cheese sauce. Layers of pasta cradle spinach, mushrooms and thin slices of leek alongside the chicken in this white lasagna. Once out of the oven, let it rest about 10 minutes—your patience will be rewarded.