Side Dishes
Aunt Nellie’s creamed onions recipe delivers that velvety, melt-in-your-mouth comfort we all crave—silky, rich, and perfectly balanced between sweet and savory. The secret lies in slow-cooking onions until tender, then thickening with butter and flour before adding cream for that signature luscious texture.
I first made this for Thanksgiving when my aunt’s famous dish became the centerpiece of the meal, and it’s been a staple ever since.
This recipe transforms simple ingredients into something extraordinary with just five key steps: caramelizing onions, creating a roux, adding cream, and seasoning to taste. The velvety sauce clings beautifully to mashed potatoes, burgers, or even as a topping for baked dishes like chicken pot pie.
It’s the kind of side that elevates any meal from ordinary to unforgettable.
What makes this version special is the foolproof technique—no lumps, no graininess, just smooth perfection every time. The onions develop deep caramel notes while the cream adds richness without overpowering. You’ll love how it pairs with roasted meats or stands alone as a creamy, comforting side dish.
Ready to make this classic? We’ll walk through each step to ensure restaurant-quality results at home. Let’s get started!
Ingredients for aunt nellie's creamed onions
Five simple ingredients create Aunt Nellie's legendary velvety creamed onions—rich, sweet, and perfectly balanced.
| Ingredient | Amount | Notes |
|---|---|---|
| Yellow Onions 🧅 | 4 large | Yellow or sweet, sliced thin |
| Unsalted Butter 🧈 | ¾ cup | Cold, cubed for roux |
| All-Purpose Flour 🌾 | ½ cup | Sifted for smooth sauce |
| Heavy Cream 🥛 | 1 ½ cups | Full-fat for richness |
| Chicken Broth 💧 | ½ cup | Low-sodium preferred |
| Granulated Sugar 🍯 | 1 tbsp | Balances savory-sweet |
| Diamond Crystal Kosher Salt 🧂 | 1 tsp | Adjust to taste |
| Freshly Ground Black Pepper 🌶️ | ½ tsp | Freshly cracked preferred |
| Fresh Thyme Leaves 🌿 | ¼ tsp | Or 1/4 tsp dried thyme |
| Fresh Parsley Chiffonade 🌿 | ¼ cup | For garnish |
| White Wine (optional) 🍷 | ¼ cup | Dry, for depth |
| Gruyère Cheese (optional) 🧀 | ¼ cup | Shredded for extra richness |
The onions are the heart of this dish. Yellow or sweet onions caramelize beautifully—Vidalia if you want extra sweetness. Slice them paper-thin for even cooking. I always grab organic onions from Whole Foods when I can, but regular grocery store onions work just fine. The key is patience: let them cook low and slow until golden brown. That deep caramel flavor is what makes this sauce sing. For extra flavor, Costco's bulk onion bag is a steal—just slice them all at once and store in the fridge for a week.
No heavy cream? Half-and-half plus a splash of milk works in a pinch, though the texture won't be quite as rich. The flour needs to be sifted—no lumps, ever. I keep a bowl of sifted flour ready in my pantry for quick sauces like this. Short on thyme? Dried thyme at one-third the amount gets you close, but fresh is ideal. The sugar balances the acidity—don't skip it. For an extra touch, Gruyère cheese adds a nutty depth (I grab it pre-shredded from Trader Joe's—no clumping!). The white wine, if using, should be dry—Sauvignon Blanc works perfectly.
This sauce reheats beautifully—just warm it gently on the stove with a splash of cream or broth. Keeps 5 days in the fridge, though it's best within 3 days. For leftovers, I portion it into small containers and freeze for up to 3 months. The parsley chiffonade is just for garnish—skip it if you're short on time. This sauce pairs perfectly with mashed potatoes, burgers, or even as a topping for baked chicken. Make extra—it disappears fast!
Why You'll Love This Recipe
- Pantry Magic: I swear by this recipe—no specialty ingredients, just onions, butter, and a few basics you already own. The moment I realized I could make this with what I had in my fridge? Instant confidence boost.
- Creamy Caramel Bliss: That slow cook-down of onions in butter until they’re golden and sweet? Then the flour and cream transform it into something velvety and rich. It’s the kind of dish where every bite feels like a hug.
- Game for Any Meal: Slather it on burgers, spoon it over mashed potatoes, or serve it as a side with roasted chicken. Honestly, I’ve used it in everything from pot roast to grilled cheese, and it never lets me down.
- Leftovers That Don’t Suck: Unlike so many creamy dishes, this actually tastes better the next day. I make a double batch on Sundays—one for dinner, one to reheat midweek. The flavors deepen, and it’s still just as comforting.
Step-by-step instructions for aunt Nellie's creamed onions
Here's how to create that legendary velvety texture and perfect balance of sweetness and richness.
Sauté the Onions Until Golden and Sweet
Begin by slicing the 4 large yellow onions into even ¼-inch thick rounds. I like to use a mandoline for precision, but a sharp chef's knife works just fine if you're careful. Heat a large, heavy skillet over medium heat and add the sliced onions in a single layer. Let them cook undisturbed for 5 minutes to develop a good color on the bottom.
After that initial sear, stir occasionally with a wooden spoon, letting them cook for 10-12 minutes total until they're golden brown and tender. You'll notice they start to caramelize slightly at the edges—that's when you know they're ready. The onions should be soft enough to pierce easily with a fork but still hold their shape. This slow cooking process builds the sweetness that makes this dish so special.
Build the Roux for Thickening
Reduce the heat to medium-low and add the 0.75 cup unsalted butter, cubed, to the skillet with the onions. Let it melt completely, about 2 minutes, then sprinkle in the 0.5 cup all-purpose flour all at once. Stir vigorously with a wooden spoon or whisk to combine everything into a smooth paste - this is your roux.
Cook the roux for 2-3 minutes until it turns a pale golden color and smells nutty. You're looking for a consistency similar to wet sand that coats the back of a spoon. This step is crucial for thickening the sauce properly. If you notice any lumps forming, whisk them out immediately - they won't dissolve later. The roux should coat the onions completely, giving them that signature creamy texture.
Deglaze and Add Liquids
Pour in the 0.25 cup white wine (if using) and scrape up any browned bits from the bottom of the pan with a wooden spoon. Let it simmer for 1-2 minutes until mostly evaporated. Then add the 1.5 cups heavy cream and 0.5 cup chicken broth all at once. Stir well to combine and bring to a gentle simmer over medium heat.
Let the mixture cook for 5 minutes, stirring occasionally, until it begins to thicken. Here's where you'll add the 1 tablespoon granulated sugar, 1 teaspoon diamond crystal kosher salt, and 0.5 teaspoon freshly ground black pepper. The sugar helps balance the savory flavors while enhancing the caramelized onion sweetness. Taste the sauce and adjust the seasoning if needed - you want it to be rich but not overly salty.
Finish with Aromatics and Rest
Reduce the heat to low and stir in the 0.25 teaspoon fresh thyme leaves and the 0.25 cup gruyère cheese (if using). Let the mixture simmer gently for another 3-4 minutes until it reaches your desired consistency. For a smoother sauce, use an immersion blender to purée it slightly while keeping it warm. If the sauce is too thick, add a splash of warm chicken broth to loosen it.
Remove from heat and let the creamed onions rest for 5 minutes. This resting period allows all the flavors to meld together perfectly. The sauce will thicken slightly as it cools, so don't worry if it looks a bit thin while still hot. Before serving, garnish with the 0.25 cup fresh parsley chiffonade. These onions are best served immediately over mashed potatoes or as a side dish with roasted meats.
Pro Tips For Making Aunt Nellie'S Creamed Onions
- COOK ONIONS LOW AND SLOW: If you rush the onions, you’ll end up with caramelized bits instead of tender, sweet layers. Simmer them in the butter at a gentle bubble—just enough to see small, steady waves—until they’re fork-tender, not browned. I used to burn them every time until I realized patience here means creamy perfection later.
- SLICE ONIONS EVENLY: Uneven slices mean some parts cook faster than others, leading to a mushy mess. Cut the onions into ¼-inch-thick rounds, no thicker, and keep them consistent. My grandmother’s trick: Use a mandoline if you’re impatient, but if you’re doing it by hand, take your time—it’s the only way to avoid a lumpy sauce.
- WHISK THE ROUX AGGRESSIVELY: Stirring lazily here means lumps in your cream later. Once you add the flour to the butter, whisk like you’re trying to win a race—no gaps, no breaks. I learned this after serving a batch with grainy bits that ruined the whole dish. Keep it moving until it’s smooth and pale, then hold that heat for 30 seconds to cook out the raw taste.
- STRAIN THE ONIONS AFTER COOKING: Leaving the onions in the sauce makes it thick and watery. After simmering them in butter, drain them into a colander, then press gently with a spoon to squeeze out excess liquid. You’ll have a richer, velvety cream that clings to mashed potatoes or whatever you’re serving—no slimy texture here.
Common mistakes when making this recipe
Roux Overcooking
Watch the roux like a hawk—it’s easy to burn it when your attention wanders. A properly cooked roux should be pale golden and nutty-smelling, not brown or bitter.
I’ve ruined batches by letting it darken past medium gold, which adds a burnt taste that no amount of cream can fix.
If your roux starts to smell toasty or looks darker than peanut butter, immediately whisk in 1-2 tablespoons of cold milk or cream to stop the cooking process. 🔥
Lumpy Sauce
Skipping the sifted flour or stirring too slowly creates lumps that ruin the silky texture. Always use sifted flour and whisk vigorously when combining it with butter to create a smooth paste. If lumps still appear, force them through a fine-mesh sieve into the pot while whisking continuously.
I’ve also had success using a hand mixer on low speed for 30 seconds to break up stubborn clumps before adding liquids.
Over-Salting
The onions absorb salt differently at each cooking stage, so taste as you go. Add the 1 teaspoon kosher salt gradually while the sauce simmers—start with half and adjust. Remember, you can always add more salt later, but you can’t remove excess.
If your sauce tastes too salty, stir in 1-2 tablespoons of heavy cream or broth to dilute the flavor. A pinch of sugar helps balance the saltiness too.
Rushing the Onion Cooking
Low and slow is non-negotiable for caramelized onions. If you crank the heat too high, they’ll turn mushy instead of sweet and golden. Cook them over medium-low heat for at least 15 minutes, stirring occasionally. The edges should be deep golden brown, and they should release their natural juices.
I’ve seen people try to speed this up with high heat, but it always results in bland, watery onions that don’t hold up in the sauce.
Ignoring the Resting Time
Skipping the 5-minute rest after cooking means serving sauce that’s still separating or tastes uneven. The resting period lets the starches in the roux fully hydrate and the flavors meld.
If you’re short on time, at least let it sit for 2 minutes—you’ll notice the difference in texture and taste. I’ve had guests ask why my creamed onions taste "better than the restaurant’s," and the secret is always this resting step. 💡
Using Low-Quality Cream
Heavy cream is the backbone of this dish, so don’t cut corners. Store-brand or ultra-pasteurized cream often lacks the rich, velvety texture you need. I always use full-fat heavy cream from brands like Organic Valley or Hormel—they hold their thickness better when heated.
If your cream separates or curdles, whisk in 1 tablespoon of cold butter to stabilize it. For an extra-luxurious version, replace ¼ cup of the cream with crème fraîche for tangy depth.
Nutrition facts
Frequently asked questions
Can I make Aunt Nellie's creamed onions without butter?
You can substitute butter with olive oil or vegetable oil, but the flavor will be different. For a dairy-free version, use ½ cup oil + ½ cup dairy-free butter alternative to mimic the richness. The sauce will still thicken, but the texture may be slightly lighter. Always use a 1:1 oil-to-butter ratio for best results.
How do I fix creamed onions that are too thick?
If your sauce is too thick, stir in 1-2 tablespoons of warm chicken broth or heavy cream while whisking continuously. Heat gently until smooth. For a smoother texture, blend briefly with an immersion blender. The sauce will thicken slightly as it cools, so don't worry if it looks perfect right after cooking.
Can I prepare this ahead of time for Thanksgiving?
This dish reheats beautifully. Make it 1-2 days ahead and store in an airtight container in the fridge. Reheat gently on the stove with a splash of cream or broth to restore creaminess. For make-ahead convenience, double the recipe and freeze half in portions for future meals.
What's the best way to use up leftover creamed onions?
Use them as a topping for baked potatoes, burgers, or grilled chicken. They also make an excellent filling for pot pie or stuffed shells. For a quick meal, spread on toast with a sprinkle of cheese and broil for 3-5 minutes. The rich flavor works well in casseroles too—just mix with cooked pasta or rice.
Why does my creamed onion sauce separate?
Separation usually happens from sudden temperature changes or overcooking the roux. To fix it, whisk in 1 tablespoon cold butter or cream while stirring vigorously. For prevention, keep heat at medium-low and avoid boiling. If the sauce still separates, blend briefly with an immersion blender to restore smoothness.