• 0.8 kg broccoli florets, cut into 1.5 inch pieces
• 2 zucchini, sliced into half-moons
• 2 red bell pepper, cut into 1 inch pieces
• 1 red onion, cut into wedges
• 3½ tbsp olive oil
• 1⅓ tsp salt
• ½ tsp black pepper
• ¾ tsp garlic powder
• 2 pinch red pepper flakes, optional

Metric measurements are approximate conversions.