How to Make It
Place racks in upper third and middle of oven. Place a baking sheet on top rack; place a pizza stone on middle rack. Preheat oven to 500°F.
Spread onion on hot baking sheet; spray with cooking spray. Bake at 500°F until browned, 8 to 9 minutes. Set aside.
Process collard greens, olives, 3 1/2 tablespoons Parmesan cheese, olive oil, 1 tablespoon canola oil, lemon zest and juice, garlic, and 1/8 teaspoon salt in a food processor until smooth. Brush crust with remaining 1 tablespoon canola oil. Spread pesto mixture on crust. Top with mozzarella and onion.
Transfer pizza to hot pizza stone. Bake at 500°F until cheese is melted, 5 to 7 minutes. Drizzle with balsamic glaze; sprinkle with basil, red pepper, remaining 1 tablespoon Parmesan, and remaining 1/4 teaspoon salt.