Start by chopping the carrots, onion and zucchini and place them in a bowl. Then, chop the spinach and mince the garlic and place them in a separate bowl. Now, preheat the oven to 400°.
Heat olive oil over medium heat in a large skillet, then add the carrot/onion/zucchini mixture and sauté until soft, about 8 minutes. Then add the spinach and garlic and sauté for 2 minutes. Transfer the cooked veggies to a large bowl.
While the veggies are cooking, bring a large pot of salted water to a boil, then cook the lasagna noodles until they're al dente -- be careful not to over-cook or they'll be too soft to work with and fall apart.
Add the cottage cheese and parmesan to the bowl with the veggies and stir to combine. Add salt and pepper to taste.
Next, assemble the lasagna: spread ½ cup marinara sauce on the bottom of a 9x13 baking dish, then place 3 lasagna noodles on top. Spread HALF of the cottage cheese mixture on top, then 1 cup of the marinara sauce, then ½ cup of mozzarella cheese. Repeat this same process, starting with 3 lasagna noodles for the second layer. For the final layer, add the last 3 lasagna noodles, then top them with 1 cup of marinara sauce and 1 cup of mozzarella cheese.
Cover the dish with aluminum foil, then place it in the oven and bake it for 15 minutes. Remove the foil, then bake for an additional 10-12 minutes or until the cheese is melted.
Top the lasagna with chopped fresh parsley or basil, then slice it into 12 pieces. Enjoy!