• 2.3 kg broccoli florets, cut into 1.5 inch pieces
• 5 zucchini, sliced into half-moons
• 5 red bell pepper, cut into 1 inch pieces
• 2½ red onion, cut into wedges
• 10 tbsp olive oil
• 3¾ tsp salt
• 1¼ tsp black pepper
• 2½ tsp garlic powder
• 5 pinch red pepper flakes, optional

Metric measurements are approximate conversions.