Remove 1 cup mozzarella cheese. Set aside. In a bowl, combine remaining mozzarella, ricotta, eggs, Parmesan, garlic powder, and ½ teaspoon salt. Cook carrots in microwave for 2 minutes. Stir into cheese mixture and set aside.
In a separate bowl, stir remaining ½ teaspoon salt into zucchini. Spray Crock Pot with cooking spray. Spread ⅓ sauce on bottom. Gently break 2 noodles to fill and cover bottom.
Spread 1 cup cheese mixture over the noodles. Top with 1 cup shredded zucchini. Top with ⅔ cup marinara sauce. Repeat with a second layer (2 noodles, 1 cup cheese mixture, 1 cup shredded zucchini and ⅔ cup marinara sauce).
Add a third layer of noodles and top with the remaining cheese mixture and zucchini only. Top with noodles and remaining marinara sauce, then sprinkle with the reserved 1 cup mozzarella.
Cook on High for 3 hours. Let stand 15-20 minutes before serving.
Recipe by Maryann Jacobsen at https://maryannjacobsen.com/family-dinners-slow-cooker-veggie-lasagna/