Butternut Squash Lasagna

Cooking spray

chopped onion

fresh spinach

shredded sharp provolone cheese

chopped fresh flat-leaf parsley

salt

freshly ground black pepper

large eggs

carton part-skim ricotta cheese

carton fat-free ricotta cheese

diced peeled butternut squash

Smoky Marinara

oven-ready lasagna noodles (such as Barilla)

grated fresh Parmesan cheese