Mix spinach, turkey, egg, bread crumbs, 3/4 cup parmesan, mozzarella, garlic salt and pepper. Form into about 30 meatballs.
Heat oil in large frying pan over med-high heat. brown meatballs for 2-3 minutes. Once browned, bake meatballs on baking sheet for about 20 minutes.
While meatballs are baking, bring a lightly salted pot of water to a boil and cook spaghetti. Once finished, reserve 1 cup pasta water before draining.
Deglaze meatball pan with white wine. Add butter and garlic & let thicken slightly. Pour over drained spaghetti and toss to coat; add some of reserved pasta water to moisten if needed. Add meatballs. Sprinkle with 1/4 cup parmesan.