Oven Caramelized Onions Recipe
This Oven Caramelized Onions Recipe is an easy, mostly hands off kitchen hack on how to caramelize onions in the oven! Add mouthwatering flavor and take a dish from ordinary to extraordinary with these perfectly caramelized onions!(Scroll down for the detailed measurements and instructions in the printable recipe card at the bottom of the page.)
Equipment
- 1 Large Sheet Pan (Baking Sheet)
- Aluminum Foil (as needed)
Ingredients
- 4 large Yellow Onions – thickly sliced (SEE NOTES)
- 4 cloves Garlic – smashed & peeled
- 4 fresh Thyme Sprigs
- 1-2 TBS Light Brown Sugar (SEE NOTES)
- 5 TBS Olive Oil
- Kosher Salt & Ground Black Pepper
- 1 tsp Worcestershire Sauce - optional
- 1 TBS Balsamic Vinegar - optional
Instructions
- Preheat oven to 375 degrees F.
- Toss onions: Place onions, garlic and thyme on a large, rimmed sheet pan. Sprinkle with brown sugar, drizzle with 5 tablespoons of oil and season generously with salt and pepper. Toss everything together until evenly coated.
- Cover the pan with foil and roast in the oven for 25 minutes, tossing once halfway through cooking. Remove foil and continue to cook for an additional 25-35 minutes, or until softened and golden in color, removing onions from the oven and tossing the onions 2-3 during cooking. If you prefer a darker color, switch the oven to broil and broil for 5 minutes - watch the onions carefully as they can easily burn!!
- Remove the pan from the oven and discard thyme sprigs (SEE NOTES). Drizzle onions with Worcestershire sauce and/or Balsamic if using. Toss to combine.
- Serve: Taste and adjust for seasoning with salt and pepper. Serve and enjoy!
Notes
- While yellow onions are my preferred onion to use, you can use whatever variety of onion you prefer – red, sweet or white works as well!
- 4 onions will seem like a lot on the baking sheet, but do not be alarmed. Onions will cook down by a ton (they will shrink to about a 6th of the amount).
- The brown sugar is optional. I used 1 ½ tablespoons because I like the extra depth of sweetness it gives the caramelized onions.
- I tossed my onions 4 times during baking. Please note, the more you toss the onions, the less likely the edges are to burn and the more evenly they will caramelize.
- If you don’t like roasted garlic, feel free to discard the cloves when you discard the thyme sprigs or you can keep them whole, mince or slice them. I removed the cloves, thinly sliced them and then tossed them back in the onions before serving.
Nutrition
Calories: 178kcal Carbohydrates: 12g Protein: 1g Fat: 14g Saturated Fat: 1g Sodium: 15mg Potassium: 162mg Fiber: 1g Sugar: 6g Vitamin A: 30IU Vitamin C: 9.1mg Calcium: 29mg Iron: 0.5mg