To prepare this Creamy Zucchini Ricotta Pasta as a gluten-free dish, substitute the penne pasta with certified gluten-free pasta made from rice, corn, chickpeas, or a similar gluten-free grain. Ensure the panko breadcrumbs are gluten-free if using the crispy topping. All other ingredients — ricotta, zucchini, lemon, olive oil, and seasonings — are naturally gluten-free. Adjust cooking times for gluten-free pasta as they may vary by brand.