01 - Preheat oven to 400°F (200°C). Spread cauliflower florets on a baking sheet, drizzle with 1 tablespoon olive oil, and roast for 20 minutes until tender and lightly golden. Let cool slightly.
02 - In a food processor, combine chickpeas, roasted cauliflower, red onion, garlic, and parsley. Pulse until the mixture is cohesive but still has some texture.
03 - Transfer the mixture to a bowl. Add breadcrumbs, egg (or flaxseed egg), lemon juice, cumin, smoked paprika, coriander, salt, and pepper. Mix well until thoroughly combined.
04 - With damp hands, shape the mixture into 4 equal patties. If the mixture is too wet, add additional breadcrumbs, 1 tablespoon at a time, until it holds together.
05 - Heat 1 tablespoon olive oil in a large skillet over medium heat. Cook patties for 4 to 5 minutes per side, or until golden brown and heated through.
06 - Toast burger buns if desired. Assemble each burger with a patty, salad greens, sliced tomatoes, pickles, and your favorite sauces and toppings.