• Preheat oven to 400ºF. Toss cauliflower florets with olive oil, garlic powder, salt, pepper and cayenne to coat. Spread in single layer on parchment paper-lined baking sheet. Bake for 30 to 35 minutes or until cauliflower is tender.
• Meanwhile, heat tomato sauce with pesto in saucepan over medium heat or until heated through.
• Arrange cauliflower on a platter. Drizzle with sauce. Sprinkle with walnuts and parsley.

Tip: Grate fresh Parmesan cheese over cauliflower in last 5 minutes of cooking time.