Italian Turkey and Spaghetti Squash Pie

medium uncooked spaghetti squash

pound(s) uncooked ground turkey breast

olive oil

small uncooked onion(s) chopped

clove(s), medium garlic clove(s) minced

canned diced tomatoes undrained

Italian seasoning or more to taste

fat-free ricotta cheese

large egg(s)

spray(s) cooking spray nonstick

cup(s) shredded fat free mozzarella cheese