Baked Onions with Asiago Cheese

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Golden, tender, and bubbling with cheesy goodness—these Baked Onions with Asiago Cheese are a savory delight that transforms humble ingredients into something extraordinary. Each onion becomes sweet and soft as it roasts, layered with a rich, creamy cheese sauce that crisps up into a golden topping. It’s comfort food at its finest, with a hint of elegance that makes it perfect for dinner parties or cozy Sunday dinners.

This dish is all about contrast: the natural sweetness of slow-cooked onions paired with the nutty, slightly sharp flavor of Asiago cheese. Topped with herbs and baked until bubbly and golden, these onions become the kind of side dish that steals the spotlight. You can serve them alongside a hearty roast or let them shine as a vegetarian main. Either way, they’ll have everyone asking for seconds.

Why You’ll Love This Baked Onions with Asiago Cheese Recipe

• Incredible flavor: The onions caramelize beautifully in the oven, soaking up the creamy, cheesy sauce.
• Easy ingredients: Everything you need is simple and likely already in your pantry or fridge.
• Versatile: Serve as a side, a starter, or even a meatless main course.
• Make-ahead friendly: Assemble them ahead of time and just pop them in the oven when you’re ready.
• Impressive yet simple: It looks gourmet but is a breeze to prepare.

What Kind of Onions Should I Use?

Sweet onions like Vidalia or Walla Walla are ideal for this recipe. Their natural sugars caramelize during baking, balancing perfectly with the savory Asiago. If you only have yellow onions on hand, those work well too—just be sure to bake them until fully tender so you still get that melt-in-your-mouth texture. Avoid red onions for this dish as their sharper bite doesn’t mellow out the same way.

Ingredients for the Baked Onions with Asiago Cheese

Each ingredient in this dish plays an essential role in building the creamy, savory, and slightly sweet flavor profile. Here’s what you’ll need and why it’s important:

• Large sweet onions – These are the stars of the dish. When baked, they become soft, sweet, and full of flavor.
• Asiago cheese (shredded) – Nutty, tangy, and beautifully melty, Asiago adds that rich, gourmet touch.
• Heavy cream – Creates a velvety sauce that blends perfectly with the cheese as it bakes.
• Butter – Adds depth and richness, helping to brown the tops and enhance flavor.
• Garlic (minced) – Infuses the dish with a gentle, savory aroma that complements the onions.
• Salt and pepper – Essential for seasoning and balancing the sweetness of the onions.
• Dried parsley or thyme – A sprinkle on top gives an herbal lift and a pop of color.

How To Make the Baked Onions with Asiago Cheese

Step 1: Prep the Onions

Peel the onions and slice off just enough from the top and bottom so they stand upright. Carefully hollow out the center using a spoon or melon baller, leaving a thick enough wall to hold the filling.

Step 2: Make the Cheese Sauce

In a saucepan over medium heat, melt butter and sauté garlic until fragrant. Stir in heavy cream and bring it to a simmer. Remove from heat and add half of the shredded Asiago cheese. Stir until smooth.

Step 3: Fill and Assemble

Place the hollowed onions in a baking dish. Spoon the cheese sauce into each onion cavity until nearly full. Sprinkle the remaining Asiago on top, followed by a pinch of salt, pepper, and dried herbs.

Step 4: Bake to Perfection

Preheat your oven to 375°F (190°C). Cover the baking dish loosely with foil and bake for 30 minutes. Uncover and bake an additional 15-20 minutes until the cheese is bubbly and golden-brown.

Step 5: Let Them Rest

Remove from the oven and allow the onions to rest for 5-10 minutes before serving. This helps the cheese set and makes them easier to plate.

Serving and Storing Your Baked Onions with Asiago Cheese

This recipe makes enough to serve 4 to 6 people, depending on whether it’s a side or the main event. These baked onions are best enjoyed warm, right out of the oven, when the cheese is perfectly melted and the onions are fork-tender.

To store leftovers, place the onions in an airtight container and refrigerate for up to 3 days. Reheat them in the oven at 350°F (175°C) until heated through. Microwaving is also an option, though it may soften the cheese topping.

If you’re planning ahead, assemble the dish the day before, refrigerate it covered, and then bake just before serving. It’s a great time-saver when entertaining!

What to Serve With Baked Onions with Asiago Cheese?

Herb-Crusted Roast Chicken

The juicy, herby flavors of roast chicken pair beautifully with the richness of the onions.

Grilled Steak

Serve alongside a perfectly grilled ribeye or sirloin for a steakhouse-worthy meal at home.

Garlic Mashed Potatoes

Creamy potatoes complement the texture of the baked onions and soak up any extra sauce.

Mixed Green Salad

A crisp salad with vinaigrette helps cut through the richness and adds freshness to your plate.

Roasted Brussels Sprouts

Their slightly bitter flavor balances the sweetness of the onions.

Crusty Bread

Use it to scoop up every last drop of cheese and cream from the plate.

White Wine (like Chardonnay)

A chilled glass of white wine brings out the nutty tones in the Asiago and brightens the dish overall.

Creamy Polenta

Soft and buttery, it makes a cozy base if you’re turning these onions into a vegetarian main.

Frequently Asked Questions

Can I use a different cheese besides Asiago?
Absolutely! Parmesan, Gruyère, or even a sharp white cheddar can work well in this recipe. Each will bring its own unique flavor, so feel free to experiment based on what you have on hand.

Do I need to hollow out the onions?
Hollowing allows you to fill the onions with cheese sauce and gives them a beautiful presentation. If you’re in a rush, you can slice the onions in half, top them with sauce and cheese, and bake them flat-side up.

Can I make this recipe dairy-free?
Yes! Substitute the heavy cream with a dairy-free alternative like cashew cream or oat milk, and use a plant-based cheese that melts well.

Can I freeze baked onions?
Freezing isn’t ideal for this dish, as the texture of the onions and the creamy sauce may suffer. It’s best enjoyed fresh or within a couple of days from the fridge.

What size onions should I use?
Aim for medium to large onions that are roughly the same size, so they cook evenly and hold a good amount of filling.

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And let me know in the comments how yours turned out! Did you try a different cheese or add herbs from your garden?
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Conclusion

Baked Onions with Asiago Cheese are the kind of dish that reminds you just how satisfying simple ingredients can be. They’re rich, comforting, and full of flavor—perfect for both weeknight dinners and special occasions. Whether you’re serving them with roast chicken or enjoying them as a stand-alone vegetarian dish, they never disappoint. Give them a try, and you’ll find yourself making them again and again.

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