Chicken, Spinach and Artichoke Cannelloni

Nonstick cooking spray

flat no-boil lasagna noodles (such as Barilla)

fresh baby spinach (packed)

frozen artichoke hearts (about 1/2 cup), thawed, patted dry and coarsely chopped

large boneless skinless chicken breast half (about 1 cup), cooked and diced

cream cheese with chives and onions (1/2 of an 8-ounce container), room temperature

garlic, minced

shredded Mozzarella cheese, divided

salt and freshly ground black pepper,

butter

all-purpose flour

milk (whole or 2%)

freshly grated Parmesan cheese, divided

ground nutmeg