Baked Onions with Asiago Cheese

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Baked Onions with Asiago Cheese

These Baked Onions with Asiago Cheese are a sophisticated, melt-in-your-mouth side dish that transforms the humble onion into something truly elegant. Slow-roasting the onions coaxes out their natural sugars, resulting in a deep, savory sweetness that contrasts perfectly with the sharp, nutty bite of aged Asiago cheese.

Whether you’re serving these alongside a holiday roast or a simple grilled steak, they offer a creamy, “melted-on” texture that rivals any steakhouse side.

Recipe Details

  • Prep time: 10 minutes

  • Cook time: 45–50 minutes

  • Servings: 4

  • Difficulty: Easy

Ingredients

  • 4 Large Yellow or Sweet Onions (Vidalia or Walla Walla work best)

  • 2 tbsp Unsalted Butter, melted

  • 1 tbsp Extra Virgin Olive Oil

  • 1 cup Asiago Cheese, freshly shredded

  • 2 cloves Garlic, minced

  • 1 tsp Dried Thyme (or 1 tbsp fresh thyme leaves)

  • Salt and Black Pepper to taste

  • Optional: Fresh parsley for garnish

Instructions

  1. Prepare the Oven: Preheat your oven to 200°C (400°F). Lightly grease a baking dish or cast-iron skillet.

  2. Prep the Onions: Peel the onions and slice off the ends. Cut them in half horizontally (across the middle). If they won’t sit flat, trim a tiny slice off the bottom of each half.

  3. The Seasoning Mix: In a small bowl, whisk together the melted butter, olive oil, minced garlic, thyme, salt, and pepper.

  4. Arrange and Brush: Place the onion halves cut-side up in the baking dish. Brush the tops generously with the butter mixture, making sure some of it seeps between the layers.

  5. Initial Bake: Cover the dish tightly with foil. Bake for 30 minutes until the onions are tender and starting to translucent.

  6. The Cheesy Finish: Remove the foil. Pile the shredded Asiago cheese onto each onion half.

  7. Final Roast: Return to the oven (uncovered) for another 15–20 minutes. Bake until the cheese is golden brown and bubbly, and the onions are soft.

  8. Garnish: Sprinkle with fresh parsley and serve warm.

Chef’s Tips & Notes

  • Don’t Skimp on the Cheese: Asiago has a distinct “funk” and saltiness. If you can’t find it, a blend of Parmesan and Sharp White Cheddar is a solid substitute.

  • Vertical vs. Horizontal: Slicing them horizontally (the “equator”) allows the cheese to sit on top like a cap. Slicing through the root (vertically) makes them fall apart more easily.

  • Low and Slow: If you have time, you can lower the temp to 175°C (350°F) and bake for 60-70 minutes for an even deeper caramelization.

Health Benefits

  • Quercetin Rich: Onions are packed with quercetin, a powerful antioxidant that supports heart health and may reduce inflammation.

  • Digestive Health: Onions contain prebiotic fibers that feed the “good” bacteria in your gut.

  • Bone Health: Asiago provides a significant boost of Calcium and Vitamin K2, essential for maintaining bone density.

Nutritional Information (Per Serving)

Metric Amount
Calories 215 kcal
Total Fat 14g
Saturated Fat 8g
Carbohydrates 12g
Fiber 2g
Protein 9g
Sodium 310mg

Q&A

Q: Can I make this vegan?

A: Yes! Substitute the butter with more olive oil or a plant-based butter, and use a vegan parmesan or “mozzarella” style shreds.

Q: Are these too sweet?

A: Not at all. While the onions do sweeten as they roast, the garlic, thyme, and salty Asiago cheese provide a savory balance.

Q: Can I prepare these in advance?

A: You can do the initial “covered” bake up to 24 hours in advance. When ready to serve, add the cheese and do the final roast until hot and bubbly.

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