• 0.7 kg broccoli florets, cut into 1.5 inch pieces
• 1½ zucchini, sliced into half-moons
• 1½ red bell pepper, cut into 1 inch pieces
• 1 red onion, cut into wedges
• 3 tbsp olive oil
• 1⅛ tsp salt
• ⅓ tsp black pepper
• ¾ tsp garlic powder
• 1½ pinch red pepper flakes, optional

Metric measurements are approximate conversions.