Lasagna With Spinach and Roasted Zucchini

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You may think of lasagna as a rich, heavy dish, but it needn’t be. There’s no need to compensate for the absence of a traditional Bolognese sauce by packing these casseroles with pounds of ricotta and grated cheese. Some of each of those elements is welcome, but I cut the usual amounts by half in this recipe, and it was plenty satisfying. You can get ahead on lasagna by making up big batches of marinara sauce and freezing it, or in a pinch use a good commercial brand. The noodles are no-boil, wh