Turkey, Spinach & Cheese Meatballs

Ingredients

• 1 large egg
• 1 tablespoon extra virgin olive oil
• 3 garlic cloves, minced
• ½ cup Italian seasoned bread crumbs
• 3 ounces baby spinach, chopped (3½ cups whole; 1½ cups chopped)
• 3 scallions, white and green parts, finely sliced
• 1.25 pounds 93/7 ground turkey (I use Shady Brook Farms)
• 1.25 pounds Italian turkey sausage, removed from the casings (I use Shady Brook Farms)
• 1 cup shredded mozzarella (preferably whole milk but low-fat will work)
• ⅓ cup grated Parmigiano Reggiano, plus more for serving
• 1 (24 oz) jar marinara sauce, homemade or good quality store-bought