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Roasted Parmesan Creamed Onions – A Holiday-Worthy Side Dish
There are some side dishes that completely steal the spotlight at the dinner table. Turkey, ham, and roast beef may get all the attention during the holidays, but when I served these Roasted Parmesan Creamed Onions, they were the first dish to vanish! Soft, caramelized onions nestled in a rich, creamy parmesan sauce with a golden crust on top… it’s pure comfort food in every bite.
Whether you’re cooking for a family holiday dinner, a Sunday gathering, or just want to elevate a weeknight meal, this recipe is guaranteed to wow your guests. Best of all, it’s surprisingly easy to make with just a few simple ingredients.
Why You’ll Love This Recipe
- Unexpectedly delicious – Not your average onion dish; this one gets rave reviews every time.
- Perfect holiday side – Elegant enough for Thanksgiving, Christmas, or Easter.
- Rich & comforting – Creamy parmesan sauce + roasted onions = heaven.
- Easy to prepare – Just roast, pour over sauce, bake, and serve.
Ingredients You’ll Need
- 3 pounds pearl onions (or small yellow onions, peeled)
- 3 tablespoons olive oil
- Salt and pepper, to taste
- 3 tablespoons butter
- 3 tablespoons flour
- 2 cups heavy cream (or half & half for lighter version)
- 1 teaspoon Dijon mustard (adds depth)
- 1 cup grated Parmesan cheese (plus extra for topping)
- ½ teaspoon nutmeg (optional but adds warmth)
- Fresh parsley (for garnish)
Step-by-Step Instructions
1. Roast the Onions
- Preheat your oven to 400°F (200°C).
- Toss peeled onions with olive oil, salt, and pepper.
- Spread evenly on a baking sheet and roast for 25–30 minutes, until golden and tender.
2. Make the Creamy Parmesan Sauce
- In a saucepan, melt butter over medium heat.
- Whisk in flour and cook for 1–2 minutes until slightly golden (this makes a roux).
- Slowly whisk in cream, stirring constantly until thickened.
- Add Dijon mustard, nutmeg (if using), and Parmesan cheese. Stir until smooth and creamy.
3. Assemble & Bake
- Transfer roasted onions into a baking dish.
- Pour the parmesan cream sauce evenly over the onions.
- Sprinkle with extra Parmesan cheese.
- Bake at 375°F (190°C) for 15–20 minutes, until bubbly and golden on top.
4. Serve & Enjoy
- Garnish with fresh parsley and serve warm alongside your main dish.
Tips for Success
- Peeling pearl onions easily – Blanch them in boiling water for 2 minutes, then plunge into ice water. The skins will slip right off.
- Make ahead – Roast onions and prep the sauce a day in advance, then assemble and bake just before serving.
- Cheese upgrade – Try mixing Parmesan with Gruyère or Asiago for extra flavor.
- Lighter option – Swap half the cream for milk; the sauce will still be rich.
Variations
- Garlic Lovers – Add roasted garlic cloves to the sauce.
- Bacon Bliss – Sprinkle crispy bacon bits on top before baking.
- Herby Twist – Add fresh thyme or rosemary to the cream sauce.
- Cheesy Upgrade – Use a blend of Parmesan and sharp cheddar for a bolder flavor.
Frequently Asked Questions
Q: Can I use frozen pearl onions?
Yes! Thaw and pat dry before roasting.
Q: Can this be made vegetarian?
Absolutely – just make sure your Parmesan is vegetarian-friendly (some brands are).
Q: How do I store leftovers?
Keep in an airtight container in the fridge for up to 3 days. Reheat in the oven for best texture.
Q: Can I double the recipe for a crowd?
Yes, this scales beautifully—just use a larger baking dish.
Recipe Card
Roasted Parmesan Creamed Onions
Ingredients:
- 3 lbs pearl onions, peeled
- 3 tbsp olive oil
- Salt & pepper to taste
- 3 tbsp butter
- 3 tbsp flour
- 2 cups heavy cream
- 1 tsp Dijon mustard
- 1 cup Parmesan cheese, grated (plus extra for topping)
- ½ tsp nutmeg (optional)
- Fresh parsley, chopped
Instructions:
- Preheat oven to 400°F. Toss onions with olive oil, salt, and pepper. Roast 25–30 minutes until golden.
- In a saucepan, melt butter. Whisk in flour and cook 1–2 minutes. Slowly whisk in cream until thickened.
- Stir in Dijon, nutmeg, and Parmesan. Cook until smooth.
- Place onions in baking dish, pour sauce over, sprinkle with extra Parmesan.
- Bake at 375°F for 15–20 minutes until bubbly and golden.
- Garnish with parsley and serve warm.
✨ These roasted parmesan creamed onions are the perfect balance of rustic comfort and elegant flavor. Whether served alongside roasted meats, turkey, or ham, they’ll quickly become a holiday tradition in your home.
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