Follow these simple steps to create a delicious onion boil that will impress your family and friends:

1. Prepare the Onions: Peel the onions and trim the ends. Cut them into quarters, making sure to keep the layers intact.
2. Preheat the Oven: Set your oven to 400°F (200°C) to preheat while you prepare the onions.
3. Season the Onions: In a large bowl, toss the onion quarters with olive oil, salt, black pepper, garlic powder, paprika, and dried thyme until evenly coated.
4. Arrange the Onions: Place the seasoned onions in a single layer on a large baking sheet. Make sure they are not overcrowded for even cooking.
5. Add Balsamic Vinegar: Drizzle balsamic vinegar over the onions to enhance their natural sweetness and flavor.
6. Bake: Place the baking sheet in the preheated oven and bake for 40-50 minutes. Toss the onions halfway through for even roasting.
7. Garnish and Serve: Once the onions are tender and caramelized, remove them from the oven. Garnish with fresh herbs if desired, and serve warm.

These straightforward steps will guide you in creating an amazing onion boil that everyone will love.