Neeley's Baked Ziti Recipe

Ingredients

• Salt
• 1 pound ziti (or cavatappi)
• 1 pound hot Italian turkey sausage, casing removed
• 1 medium onion, chopped
• 3 cloves garlic, chopped
• 1 (28-ounce) can diced tomatoes
• 6 ounces pesto
• 15 ounces ricotta cheese
• 1 (9-ounce) package washed spinach
• Butter, for baking dish
• 2 cups shredded mozzarella, plus more for topping
• 1 1/2 cups grated Parmesan, plus more for topping