Name: Easy Caramelized Onion Mashed Potatoes
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Cuisine: American
Ingredients: 2 pounds Yukon Gold potatoes; 4 tablespoons unsalted butter (divided); 1 cup heavy cream; 1/2 cup whole milk; 2 large sweet yellow onions, thinly sliced; 1 tablespoon olive oil; 1 teaspoon salt (or to taste); 1/2 teaspoon freshly ground black pepper; 1 tablespoon chopped fresh parsley (optional, for garnish)

Creamy, buttery mashed potatoes are always a crowd-pleaser, but add golden, sweet caramelized onions on top, and you take comfort food to a whole new level. This dish is rich in flavor, incredibly satisfying, and makes for a perfect side to both casual weeknight dinners and holiday feasts.

What makes these mashed potatoes special is the silky-smooth texture paired with the deep umami of slow-cooked onions. They melt into the potatoes with just enough presence to add character without overpowering the creaminess. If you love mashed potatoes but want to give them a twist, this recipe is an absolute must-try.

Preparation Phase & Tools to Use

To create the creamiest mashed potatoes and perfectly sweet onions, the right tools are key:

Large Saucepan or Dutch Oven: You’ll need a heavy-bottomed pot to evenly boil the potatoes without scorching.
Cast Iron or Stainless Skillet: For caramelizing the onions low and slow, use a skillet that distributes heat evenly for even browning.
Potato Masher or Ricer: A ricer will give you that ultra-smooth finish, while a masher provides a more rustic texture—choose based on preference.

Wooden Spoon or Silicone Spatula: For stirring the onions to prevent sticking and ensure they caramelize without burning.
Mixing Bowl & Measuring Tools: Accurate measurements and combining your ingredients smoothly ensures perfect consistency.

Having these tools on hand not only makes the job easier but ensures each element of the dish is cooked to its best potential.

Ingredients for the Easy Caramelized Onion Mashed Potatoes

Each ingredient in this recipe plays a distinct role in building flavor and achieving that creamy, savory balance:

Yukon Gold Potatoes: Known for their buttery texture, these are the ideal potato for a rich and creamy mash.
Unsalted Butter: Adds depth and silkiness to both the onions and the mashed potatoes.

Heavy Cream: For an ultra-creamy consistency that feels indulgent with every bite.
Whole Milk: Lightens the cream while maintaining a luscious texture.
Sweet Yellow Onions: Slowly caramelized, they become the star topping that adds complexity and sweetness.

Olive Oil: Used to caramelize the onions without burning the butter.
Salt & Black Pepper: Enhances and balances the overall flavor.
Fresh Parsley (optional): A sprinkle for color and a hint of freshness at the end.

How To Make the Easy Caramelized Onion Mashed Potatoes

Step 1: Prep and Boil the Potatoes

Peel and quarter the Yukon gold potatoes. Add them to a large pot of salted water and bring to a boil. Cook for about 15–20 minutes until fork-tender.

Step 2: Start Caramelizing the Onions

While the potatoes cook, heat olive oil and a tablespoon of butter in a skillet over medium-low heat. Add sliced yellow onions and cook slowly, stirring often, until golden brown and jammy—this will take about 25–30 minutes.

Step 3: Mash the Potatoes

Drain the cooked potatoes and return them to the pot. Add in butter, warm milk, and cream. Mash until smooth and creamy, using a ricer or masher depending on your desired texture.

Step 4: Season and Taste

Stir in salt and black pepper to taste. Adjust the cream or butter for desired consistency.

Step 5: Assemble and Serve

Spoon the mashed potatoes into a serving dish. Top generously with caramelized onions and a sprinkle of fresh parsley.

How to Serve and Store Easy Caramelized Onion Mashed Potatoes

These mashed potatoes are a cozy addition to any meal. Serve them warm as a side dish for roast chicken, turkey, beef, or even a hearty vegetarian main. The caramelized onions add a gourmet touch that turns ordinary potatoes into a standout side.

To store, let the mashed potatoes cool to room temperature and transfer to an airtight container. Refrigerate for up to 4 days. Reheat gently on the stovetop or in the microwave, adding a splash of milk or cream to restore creaminess. The caramelized onions can be stored separately and added just before serving to maintain their texture.

Frequently Asked Questions

What type of potatoes work best for mashed potatoes?

Yukon Golds are a favorite for their natural creaminess and buttery flavor. Russets work too, but they’re more starchy and can become fluffy rather than creamy.

Can I use milk only and skip the heavy cream?

Yes, but the result will be a little lighter and less rich. You can increase the butter slightly to compensate.

How do I avoid gluey mashed potatoes?

Avoid over-mashing, especially with a food processor. Using a ricer or hand masher and mixing gently keeps the texture smooth and light.

How long do caramelized onions take?

To properly caramelize onions, plan for 25–30 minutes on low heat. Rushing the process will lead to browning, not caramelization.

Can I make this ahead of time?

Absolutely. Prepare the mashed potatoes and onions a day in advance. Reheat with a bit of cream or milk, and stir the onions in just before serving.

Are these freezer-friendly?

Mashed potatoes can be frozen, but the texture might change slightly. Freeze in a sealed container for up to one month. Reheat slowly and stir well.

Want More Side Dish Ideas with a Twist?

If these Easy Caramelized Onion Mashed Potatoes hit the spot, you might enjoy these other flavorful side dishes from Life With Olivia:

Cheesy Ranch Potatoes for a bold, creamy upgrade to your potato game.

Scalloped Corn Casserole that’s both hearty and crowd-pleasing.
Honey Butter Skillet Corn with sweet-and-savory flavor in every bite.
Soft and Fluffy Homemade Naan Bread if you’re craving a buttery, pillowy side.

Delicious Corned Beef Hash for a hearty breakfast-for-dinner pairing.

Save This Recipe for Later

📌 Save this recipe to your Pinterest board so you can always come back to it: Life With Olivia Pinterest

And let me know in the comments how yours turned out. Did you add garlic or fresh thyme? Did you go extra creamy or keep it rustic?

I love seeing how you all make these dishes your own. If you have questions, tips, or tricks, feel free to share—we’re in this kitchen adventure together.

Easy Caramelized Onion Mashed Potatoes

Author: Olivia McKenney
Total Time: 45 minutes

Yield: 6 servings
Diet: Vegetarian

Print Recipe

Description

These Easy Caramelized Onion Mashed Potatoes are creamy, buttery, and topped with perfectly sweet caramelized onions. The combo creates a comforting, gourmet side dish that works just as well for holiday dinners as it does for weeknight meals.

Ingredients

2 pounds Yukon Gold potatoes

4 tablespoons unsalted butter (divided)

1 cup heavy cream

1/2 cup whole milk

2 large sweet yellow onions, thinly sliced

1 tablespoon olive oil

1 teaspoon salt (or to taste)

1/2 teaspoon freshly ground black pepper

1 tablespoon chopped fresh parsley (optional, for garnish)

Instructions

1. Peel and quarter the Yukon Gold potatoes. Add to a large pot with salted water. Bring to a boil and cook for 15–20 minutes until fork-tender.

2. While potatoes cook, heat olive oil and 1 tablespoon butter in a skillet over medium-low heat. Add sliced onions and cook slowly, stirring often, for 25–30 minutes until golden and jammy.

3. Drain potatoes and return them to the pot. Add remaining butter, warm milk, and heavy cream. Mash using a potato masher or ricer until smooth and creamy.

4. Season the mashed potatoes with salt and black pepper to taste. Stir to combine and adjust texture with additional milk or cream if needed.

5. Transfer mashed potatoes to a serving dish. Top with caramelized onions and garnish with chopped fresh parsley.