Spinach Lasagna Rolls

homemade marinara sauce, plus more for serving

uncooked lasagna noodles, wheat or gluten-free

package frozen chopped spinach, thawed and squeezed well

part skim ricotta cheese (I like Polly-o)

grated Parmesan cheese

large egg

kosher salt and fresh pepper

(about 3 oz) part skim mozzarella cheese, shredded