Butter Roasted Onions

Butter Roasted Onions are a comforting and silky side dish, filled with sweet caramelized flavors that elevate any meal.

Prep Time 10

Cook Time 50

Total Time 1

Course Side Dish, Vegetarian

Cuisine American

Servings 6 servings

Calories 150 kcal

6 medium medium yellow onions, peeled Sweet and sturdy for roasting.
4 tablespoons unsalted butter, melted For that rich, indulgent finish.
1 tablespoon olive oil Helps the butter roast evenly and prevents burning.
1 tablespoon honey or maple syrup Boosts caramelization and deepens flavor.
1 teaspoon sea salt Plus extra to taste — brings out the onion’s natural sweetness.
1/2 teaspoon freshly ground black pepper
2 sprigs fresh thyme or 1/2 teaspoon dried thyme Aromatic and bright.
2 tablespoons balsamic vinegar (optional) A glossy finish with subtle tang.
to taste nutritional yeast Adds cheesy flavor without dairy; optional sprinkle for serving.

Preheat your oven to 400°F (200°C). Line a baking sheet with parchment for easy cleanup.
Trim the root and tip of each onion, keeping the base intact so the layers stay together. Cut a shallow X into the top to help the butter penetrate.
In a small bowl, whisk melted butter and olive oil with honey, salt, and pepper until combined.
Arrange the onions on the baking sheet, brush generously with the butter mixture, and tuck thyme sprigs among them.
If using balsamic, drizzle a little over each onion.

Roast for 40–50 minutes, basting once or twice with the pan juices until edges are browned and centers are soft.
Remove and let rest for 5 minutes. Spoon pan juices over the onions and finish with a light sprinkle of nutritional yeast or flaky sea salt if desired. Serve warm.

For a festive twist, scatter pomegranate arils over the warm onions before serving. Make it smoky by swapping half the butter for browned butter.

Keyword Butter Roasted Onions, Caramelized Onions, Comfort Food, Roasted Onions, Vegetable Side Dish