Zucchini Lasagna

INGREDIENTS

• 1/2 cup freshly grated Parmesan cheese (2 ounces)
• 2 1/2 tablespoons extra-virgin olive oil
• 1/4 teaspoon freshly ground black pepper
• 3 tablespoons chopped fresh oregano
• 1 (28-ounce) can diced tomatoes
• 1 small onion, finely chopped
• 1/2 teaspoon red pepper flakes
• 2 medium zucchini
• 2 teaspoons salt
• 1 cup part-skim ricotta cheese
• 1 pound ground turkey