Sweet Onion Casserole

2. Prepare the Filling
Preheat your oven to 375°F (190°C). In a mixing bowl, combine the caramelized onions with the grated Gruyère cheese and heavy cream. Mix gently until everything is evenly coated.

3. Assemble the Casserole
Transfer the onion mixture to a greased 8×8-inch baking dish, spreading it out evenly.

4. Make the Crumb Topping
In a small bowl, mix together the breadcrumbs, Parmesan cheese, and melted butter. Sprinkle this mixture generously over the top of the casserole.

5. Bake Until Golden
Bake in the preheated oven for 25–30 minutes, or until the topping is golden brown and the filling is bubbly around the edges.

6. Let It Rest and Serve!
Remove the casserole from the oven and let it rest for 5 minutes before serving. Garnish with fresh parsley if desired, and enjoy!

Tips for Making the Best Sweet Onion Casserole
Patience Pays Off: Caramelizing onions takes time but results in unmatched sweetness and depth of flavor. Don’t rush this step!
Switch Up the Cheese: While Gruyère is traditional, feel free to use Swiss, cheddar, or even mozzarella depending on your preference.
Add Protein: For a heartier version, stir in cooked bacon bits or crumbled goat cheese into the filling.
Make Ahead: Prepare the caramelized onions up to a day in advance and refrigerate them until ready to assemble the casserole.
Serve Hot: This casserole tastes best straight out of the oven, so plan accordingly for serving times.
Why This Recipe Deserves a Spot on Your Table
The Sweet Onion Casserole isn’t just another dish—it’s a celebration of simple yet powerful ingredients coming together to create something extraordinary. Whether you’re hosting guests, celebrating a special occasion, or simply looking for a cozy weeknight dinner, this recipe delivers comfort and flavor in equal measure.

So gather your onions, roll up your sleeves, and get ready to enjoy one of the most satisfying casseroles you’ve ever made. Trust us—once you taste this, you’ll want to make it again and again!

Have You Tried It Yet?
Let us know how this recipe turned out for you! Share your thoughts in the comments below or tag us on social media with your creations. Happy cooking, and remember—onions never fail to bring warmth and joy!