Cheeseburgers in Foil with Veggies and Potatoes

Ingredients (9)

• 4 quarter-pound hamburger patties,
• 1 red onion,
• 4 to 5 medium Yukon Gold potatoes,
• 1 tablespoon olive oil
• 4 slices cheddar cheese
• 1 teaspoon garlic powder
• Sea salt and pepper,
• 4 hamburger buns,
• 4 12-inch sheets of heavy duty aluminum foil