• 1.1 kg broccoli florets, cut into 1.5 inch pieces
• 2½ zucchini, sliced into half-moons
• 2½ red bell pepper, cut into 1 inch pieces
• 1½ red onion, cut into wedges
• 5 tbsp olive oil
• 1¾ tsp salt
• ⅔ tsp black pepper
• 1¼ tsp garlic powder
• 2½ pinch red pepper flakes, optional

Metric measurements are approximate conversions.