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Preheat your oven to 400°F (200°C).
Prepare Onions:
Peel the onions and toss them in olive oil, salt, and pepper.
Roast:
Spread onions on a baking sheet and roast for 25–30 minutes, turning once halfway through, until golden and tender.
Make Parmesan Cream:
In a saucepan over medium heat, melt butter. Add heavy cream and garlic powder, stirring gently until warm but not boiling.
Add Cheese:
Stir in grated Parmesan cheese and continue cooking until the sauce thickens slightly.
Combine:
Add the roasted onions to the cream sauce, stirring gently to coat.
Serve:
Transfer to a serving dish and garnish with fresh parsley.
Serving and Storage Tips
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