The Easiest Soufflé You’ll Ever Make
Deeply caramelized onions meet a rich, custardy base and a crackly Parmesan crust for a simple, savory soufflé that’s equal parts elegant and comforting. The edges bake up bronzed and crisp; the center stays softly set and silky—like French onion soup crossed with a cloud (or so says my close family friend! 😂). I’ve served this as part of our Thanksgiving menu alongside turkey and cheesy creamed spinach with Gruyere for as long as I can remember!
It’s an unfussy, bake-and-serve dish that skips the drama of whipped egg whites but still delivers lift, aroma, and that irresistible “pouff.” It’s my favorite holiday dish for entertaining (though it’d be fantastic casserole for a Sunday brunch!), and I’m pretty sure it’s about to become yours as well.
Step-by-Step Instructions
Full instructions and quantities can be found in the recipe card below.
Unlike a traditional French soufflé with whipped egg whites, I’ve opted for a simpler method which utilizes baking powder to provide lift while still maintaining a tender, spoonable crumb. 💯 You’re welcome!
Pair this caramelized onion soufflé with our oven-roasted turkey breast and crisp-tender green beans almondine for an elegant holiday plate.
Chef-Tested Tips 👩🏻🍳
- True caramelization takes time. Aim for deep amber, not pale gold. If they’re browning too fast, lower the heat and add a spoonful of water to dissolve the browned bits.
- Cool before mixing. Warm onions can scramble the eggs—15 minutes of cooling is your insurance.
- Bake immediately. Once the baking powder meets the wet ingredients, get it into the oven for maximum lift.
- Know when it’s done. The center should wobble like Jell-O, not slosh. A knife near the edge should come out mostly clean.
Quick Variations (Because It’s Infinitely Adaptable)
I’ve tested this recipe with a dozen different variations and each is more delicious than the last. What you’re getting here is the baseline onion custard bake, and from here you can flavor it as you like (maybe try caramelized shallots or leeks next?). A few suggestions from my trials over the years:
- Cheese: Gruyère, Comté, Fontina, or sharp cheddar make it extra melty. Try half Parmesan + half Gruyère for French onion soup vibes.
- Fold in chives, thyme or a pinch of cayenne.
- Gluten-free: Yes, it can be done! Use a 1:1 gluten-free all-purpose flour blend.
To Make Individual Servings
Divide the into buttered ramekins or an 8×8 plus a few ramekins. Start checking ~10–15 minutes earlier; pull when puffed with a slight center wobble.
And if the tops don’t get as dark, you can add 1-2 minutes under the broiler right at the end. It’s helpful to put the ramekins on a rimmed baking sheet to make transferring in and out of the oven easier.
This cheese and onion soufflé is one of those dishes that feels fancy, but really is effortless (and timeless!). Add it to your dinner rotation today or, even better, save this for your next holiday feast, and be sure to let us know what you think in the comments below!
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Cheesy Caramelized Onion Soufflé (Simple & Elegant)
Ingredients
- 1 stick (8 Tbsp) 113g unsalted butter
- 6 large Vidalia onions, peeled and thinly sliced into half moons (about 5 lbs)
- 3 tsp (15g) kosher salt, divided
- ¼ cup (30g) all-purpose flour
- 2 tsp (9g) baking powder
- 1 tsp (3g) garlic powder
- ¼ tsp ground nutmeg
- 2 cups (473ml) heavy cream
- 6 (300g) large eggs
- 1 cup Parmigiano Reggiano, grated, divided
Instructions
- Prepare the baking dish. Set an oven rack in the middle positions, then preheat an oven to 350°F (177°C). Coat a 9×13 baking dish with nonstick spray or butter, then sprinkle about 2 Tbsp of the grated Parmesan along the bottom.
- Caramelize the onions. Heat 8 Tbsp (113g) unsalted butter in a large skillet or Dutch oven over medium heat. Once melted, add thinly sliced onions and 2 tsp (10g) kosher salt, then cook, stirring occasionally and scraping up browned bits, until they turn deep golden and jammy—about 40–45 minutes, adding small splashes of water if the pan dries out. If you notice the onions browning too quickly, lower the heat slightly. Cool for about 15 minutes.
- Mix the dry ingredients. In a large mixing bowl, whisk together ¼ cup (30g) flour, 2 tsp (9g) baking powder, 1 tsp (3g) garlic powder, 1 tsp (5g) kosher salt, ¼ tsp ground nutmeg.
- Add the wet ingredients. To the flour mixture, add 2 cups (473ml) heavy cream, 6 large eggs, and the remaining grated Parmesan cheese. Whisk until very well mixed, then stir in the cooled caramelized onions.
- Bake the soufflé. Carefully pour the mixture into the prepared baking dish, then bake for 45-50 minutes, until the top is a deep golden brown and has puffed up. The edges will be more set than the center, which will jiggle a bit. Cool slightly, then serve while warm.
Notes
- Make-ahead prep: Caramelize the onions up to 4 days in advance; refrigerate and bring to room temperature before mixing. Combine with the dry ingredients and eggs/cream just before baking for best rise.
- Leftovers: Refrigerate cooled soufflé, tightly covered, for up to 3 days. I do not recommend freezing.
- Reheat: Warm slices at 300°F (149°C), loosely tented with foil, for about 15 minutes until hot.
Nutrition
Photography by Jo Harding.
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