First Step: Roast the Vegetables
Preheat your oven to 425°F (220°C). In a large bowl, toss cremini mushrooms, red bell pepper, zucchini, and yellow onion with olive oil, sea salt, and freshly ground black pepper. Spread the vegetables evenly on a parchment-lined baking sheet and roast for 20–25 minutes until tender and caramelized. Then, reduce the oven temperature to 400°F (200°C) for later use.

Second Step: Cook or Prepare Lasagna Noodles
If using regular noodles, cook them according to package instructions until al dente. Drain and toss with a tablespoon of olive oil to prevent sticking. For no-boil noodles, simply set them aside to use directly in layers.

Third Step: Prepare the Cheese Mixture
In a medium bowl, combine ricotta cheese with minced garlic, lemon zest, salt, and freshly ground pepper. Mix gently until creamy and well combined. You may substitute ricotta with blended low-fat cottage cheese for a lighter texture while maintaining creaminess.

Fourth Step: Assemble the Lasagna Layers
Grease a 9×13-inch baking dish lightly. Spread 1 cup of marinara sauce evenly on the bottom. Begin layering with noodles, half of the ricotta mixture, half of the spinach leaves, half of the roasted vegetables, and ⅔ cup of marinara sauce. Repeat the layering sequence: noodles, remaining ricotta mixture, remaining spinach, roasted vegetables, and marinara sauce. Finish with a final noodle layer topped with remaining marinara. Sprinkle shredded mozzarella and pecorino cheese evenly over the top.

Fifth Step: Bake the Lasagna
For traditional noodles, bake uncovered at 400°F for 30 minutes until the cheese is golden and bubbly. For no-boil noodles, cover with foil and bake for 40–50 minutes, then uncover and roast for a few more minutes to brown the cheese. Let the lasagna rest for 20 minutes at room temperature before slicing to set properly.

Final Step: Garnish and Serve
Garnish the lasagna with fresh basil or parsley before serving. This fresh herb adds bright aroma and visual appeal. Serve alongside a crisp green salad or your favorite side for a complete, homemade meal perfect for family dinners or entertaining guests.