Veggie-Packed Slow Cooker Lasagna

olive oil

lean ground turkey

black pepper

salt, to taste, if desired

small onion, finely chopped

bell pepper (any color), finely chopped

garlic, minced

grated carrot (2 small/medium carrots)

grated zucchini (2 small zucchini)

jars (26 ounces each) marinara sauce

whole wheat lasagna noodles (uncooked)

shredded mozzarella cheese