Oven Caramelized Onions Recipe

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Learn how to easily caramelize onions in the oven with this easy kitchen hack! This recipe produces rich, deeply-flavorful and perfectly caramelized onions that just melt-in-your-mouth! These jammy onions are so versatile and take a dish from ordinary to extraordinary – try them on salads, burgers, pizzas, steak and MORE!

About this recipe for caramelizing onions in the oven

Melt in your mouth tender, savory yet candy-sweet, highly addictive caramelized onions.

Honestly, these oven caramelized onions are so exceptionally delicious I was eating them right off the sheet pan in heaping spoonfuls. (Yes my breath was kicking. No shame.)

However, these caramelized onions are not just legit amazing in the taste department, they are also easier than pie to make. The technique of caramelizing onions in the oven, versus on the stove, significantly cuts down on time and the need for constant stirring!

Basically, these onions have the same big, bold flavor, just without all the effort!

What are caramelized onions?

Caramelization is the cooking process in which sugar browns.

Since onions are naturally sweet, caramelized onions come from the simple process of slowly cooking the natural sugar in onions over an extended period of time until they brake down to a deep brown color and are extremely soft and jam-like in texture.

Caramelizing an onion results in a magically sweet, intense onion flavor.

Expert tips for best success!

1. 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!
2. Four whole 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 6^th of the amount).
3. The brown sugar is optional. I used 1 ½ tablespoons because I like the extra depth of sweetness it gives the caramelized onions.
4. 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.
5. 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.

FAQs: frequently asked questions

What kinds of onions are best for caramelizing?

You can caramelize any type of onion, even in the oven, so feel free to try any variety in this oven caramelized onion recipe!

With that said, here are a few tips on types of onions and caramelization:

• Yellow Onions – Yellow onions are the most versatile, caramelize the fastest and yield the most flavor.
• Red Onions – With their beautiful purple color, they make a visually exciting addition to a variety of dishes such as salads and pizzas. Just be careful, because over caramelizing can turn them into an off-putting greenish-brown color.
• White onions – White onions caramelize similarly to yellow onions, however they will be slightly less complex in flavor.
• Sweet Onions (such as Vidalia or Walla Walla) – Sweet onions will yield a slightly sweeter flavor, however they tend to lack flavor complexity.

When are onions caramelized?

Caramelized onions definitely require patience! You can tell when caramelized onions are done because they will have a deep, rich golden brown color and be extremely soft to the touch.

Serving suggestions

Wondering, what are oven caramelized onions good with? Honestly, almost everything. Caramelized onions are incredibly versatile! Sweet onions make a wonderful sweet and savory addition to many dishes. Plus, they make a fantastic base of mouthwatering flavor in dips, soups and casseroles. Let’s face it, everything’s better when caramelized onions are involved!

How to use caramelized onions

• Dips – Finely chop caramelized onions and add them to your favorite creamy dips! Or, simply use them to quickly make onion dip.
• Soup – Stir caramelized onions into your soups and stews to add a deep, interesting flavor. I love adding it to apple soups, sausage zitis, and this pasta with ground sausage.
• Steak – Dress up your steaks by adding a healthy spoonful of onions on top!
• Chicken – Same as steak, caramelized onions are a delicious way to jazz up chicken.
• Pasta – Add a small amount to creamy or tomato based pastas for a sweet complement of flavor.
• Pizza – Drop caramelized onions on top of pizza to add a touch of umami and sweetness.
• Eggs – Mix caramelized onions into frittatas, use them as a filling for omelettes or use them as a topping for scrambled eggs. I personally love them in this crustless spinach bacon quiche.
• Burgers or sandwiches – Add a heaping dollop on top of homemade burgers and sandwiches. Or, finely chop caramelized onions and mix them with mayonnaise to make a homemade sandwich spread.
• Risottos – Garnish your favorite risotto recipes, like this risotto with butternut squash or risotto scallops, with some easy oven onions for extra buttery richness.
• Quesadillas – Add a couple tablespoons to your quesadilla filling to make things more interesting.
• Gnocchi Bakes – Use leftover sweet onions to make this ultra-delicious cheesy baked gnocchi.
• Puff pastry Tarts – Layer the onions with thin slices of pears, gruyere cheese, and gorgonzola on puff pastry and bake in the oven for delicious caramelized onion tarts.

Storing leftovers

Leftover caramelized onions should be stored in an air-tight container or zip-closure bag in the refrigerator. Properly stored, they will last up to a week in the fridge.

Freezing instructions

Since caramelized onions take a bit of time to make, freezing them to have on hand is a great idea!

Caramelized onions freeze beautifully and will keep in the freezer for up to 3 months.

To freeze caramelized onions, allow them to cool completely after cooking. Transfer them to a zip-closure, freezer safe bag and gently press down and around on the bag to flatten them out. Label the bag and transfer it to the freezer.

Frozen caramelized onions do not need to be thawed! You can simply use them in a recipe as is.

With the same delicious flavor and half the effort and mess, these oven caramelized onions are a game changer!!

Until next time, friends – to cooking hacks!

Cheyanne

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More onion recipes!

• Quick Pickled Red Onion
• Sauteed Onions with Peppers
• Hot Dog Onions

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