Creamy Spinach Artichoke Tortellini

fresh or frozen spinach

refrigerated 3 cheese tortellini

butter

small yellow onion (, grated)

garlic (, minced (1 1/2 Tbsp))

flour

milk

Salt and freshly ground black pepper

Neufchatel cheese ((aka light cream cheese), diced into small cubes)

finely shredded parmesan cheese ((3.2 oz))

artichoke heart quarters, chopped

chopped fresh parsley ((optional))

reserved pasta water