It's so delicious that I make it almost every day! Roasted Vegetables Recipe Happycall Double Pan

INGREDIENTS :
• 1 broccoli, small size (50 grams)
• 2 carrots, medium size (200 grams)
• 1 onion, small size (85 grams)
• 250 grams potatoes
• 3 tablespoons olive oil
• 2 teaspoons cornstarch
• 1½ teaspoons mixed herbs (rosemary, oregano, thyme)
• ½ teaspoon garlic powder
• ½ teaspoon pepper
• ½ teaspoon salt