Take a sheet of aluminum foil and place half of the onion, potato, carrot, and pepper on it.
Drizzle with a little olive oil and crumble half of the chicken bouillon cube over the vegetables.
Add ¼ tsp parsley, ¼ tsp thyme, ¼ tsp garlic powder, ¼ tsp salt, and pepper to taste.
Mix the vegetables with your fingers to ensure the seasoning is evenly distributed in the foil packet.
Sprinkle with chives, if using.
Place 1 tablespoon of butter on top of the vegetables.
Close the foil packet.
Wrap it in another sheet of foil to prevent tearing during cooking.
Repeat to make a second vegetable packet.
Grill the packets on the barbecue at 450°F—15 minutes on the top rack, then 15 minutes on the bottom rack, for a total of 30 minutes.
Check that the vegetables are tender and enjoy immediately.