Preheat oven to 200°C fan / 220°C
Brush a large non-stick baking tray with 1 tbsp olive oil and place in oven for 10 minutes
Pat chickpeas, potatoes, and cauliflower completely dry
Add vegetables and chickpeas to a large bowl and sprinkle with cornflour, mix well
Add 2 tbsp olive oil and spices (sumac, cumin, paprika, pul biber, garlic powder), mix again
Add remaining olive oil, salt, pepper, oregano, and sesame seeds, stir well
Add everything evenly to hot tray with potatoes cut side down
Roast for 30-35 minutes near the top of oven, turning potatoes and cauliflower halfway through
While vegetables roast, blend all hummus ingredients together in a blender
Spread hummus over a large platter
Top with roasted vegetables and sprinkle with sumac, cumin, paprika, pul biber, and fresh parsley
Drizzle generously with extra virgin olive oil
Serve with crusty bread
