Best Ever Caramelized Onion Mashed Potatoes
If you’re looking for a way to elevate your mashed potatoes, look no further! The Best Ever Caramelized Onion Mashed Potatoes are here to steal the show at your dinner table. This recipe transforms the classic comfort food into something truly special with the addition of sweet, buttery caramelized onions and a medley of fresh herbs. Whether it’s a busy weeknight or a festive family gathering, these mashed potatoes will warm hearts and fill bellies.
What makes this dish even more delightful is how easy it is to prepare. You can whip up the Best Ever Caramelized Onion Mashed Potatoes in just under 90 minutes, making it perfect for any occasion. Plus, they pair beautifully with so many main dishes, ensuring they’ll be a hit every time!
Why You’ll Love This Recipe
- Irresistible Flavor: The combination of caramelized onions and herbs creates a flavor explosion that will leave you craving more.
- Easy Preparation: With straightforward steps, even novice cooks can feel like pros while making these mashed potatoes.
- Family-Friendly: Kids and adults alike will enjoy these creamy potatoes, making them great for family dinners.
- Make-Ahead Convenience: Prepare the caramelized onions in advance to save time on busy days.
- Customizable: Feel free to add your favorite ingredients or adjust the herbs to match your family’s taste preferences.

Ingredients You’ll Need
You won’t need any fancy ingredients for this recipe—just simple, wholesome items that you can easily find at your local grocery store. Let’s gather what you’ll need for these delicious Best Ever Caramelized Onion Mashed Potatoes:
- 2 Tablespoons Olive Oil
- 4 Yellow Onions (sliced thin and evenly)
- 2 Pounds Yukon Gold Potatoes (washed)
- 4 Tablespoons Salted Butter (you can use non-dairy butter if preferred)
- 3/4 Cup Half & Half or Full-Fat Coconut Milk or Dairy-Free Milk
- 1 Teaspoon Kosher Salt
- 1 Cup Parmesan Cheese (freshly grated)
- 1 Bunch Chives (thinly chopped)
- 2 Sprigs Fresh Thyme (stems removed)
- 3 Leaves Fresh Sage (chopped)
Variations
One of the best things about the Best Ever Caramelized Onion Mashed Potatoes is how flexible this recipe really is! Here are some fun variations to try:
- Add Garlic: For an extra layer of flavor, sauté minced garlic along with the onions until fragrant.
- Experiment with Cheeses: Swap out Parmesan for other cheeses like Gruyère or cheddar for a different taste.
- Herb Swap: Change up the herbs based on what you have on hand—rosemary or parsley work well too!
- Make It Vegan: Use non-dairy butter and coconut milk along with vegan cheese for a completely plant-based version.
How to Make Best Ever Caramelized Onion Mashed Potatoes
Step 1: Prepare the Onions
To make these mashed potatoes, start by preparing the onions. Peel the skin from the onions and thinly slice them. It might seem like a lot of onions, but trust me on this one—it’s essential! The sweetness of caramelized onions adds depth and richness that takes these mashed potatoes to another level.
Step 2: Caramelize the Onions
Once you have sliced your onions, set them aside. Heat a skillet over medium heat and add in that lovely olive oil. When it’s hot, toss in those onions! Stir them occasionally as they cook down. This process usually takes about 40-50 minutes, but it’s worth every second as they transform into golden-brown goodness.
Step 3: Cook the Potatoes
While those heavenly onions are caramelizing, let’s move on to the potatoes. Wash them thoroughly and chop them into small pieces—no need to peel unless that’s your preference! I love leaving the skin on for added texture and fiber. Then, heat water in a pot until it reaches a rolling boil and add in those chopped potatoes. Let them cook for about 20 minutes until they’re fork-tender.
Step 4: Mash It Up
When your potatoes are done cooking, drain them well before mashing them in a large bowl. Now’s the time to get creamy! Add in that rich butter, kosher salt, and half & half (or your choice of non-dairy milk). Mash everything together until smooth; this is where all those flavors blend beautifully!
Step 5: Combine Everything
Once you’ve got those luscious mashed potatoes ready, remove half of your beautifully caramelized onions from the skillet and stir them into your potato mixture along with freshly grated Parmesan cheese. This step ensures each bite is packed with flavor!
Step 6: Final Touches
Transfer those scrumptious mashed potatoes to a large serving bowl. Top with remaining caramelized onions, sprinkle with chopped chives, thyme, sage, and drizzle melted butter over everything for an added touch of decadence. Now all that’s left is to serve and enjoy!
Pro Tips for Making Best Ever Caramelized Onion Mashed Potatoes
Making the perfect mashed potatoes is all about technique and patience, and these pro tips will help elevate your dish to new heights!
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Use fresh ingredients: Fresh herbs and high-quality butter can significantly enhance the flavor of your mashed potatoes. They add a vibrant taste that dried ingredients simply can’t replicate.
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Don’t rush the caramelization: Take your time when caramelizing the onions; the slow cooking process allows their natural sugars to develop, resulting in rich, deep flavors that will elevate your mashed potatoes.
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Mash while warm: For the best texture, mash your potatoes while they are still warm. This helps achieve a creamy consistency without becoming gummy.
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Experiment with dairy alternatives: If you’re looking for a lighter option, try using full-fat coconut milk or non-dairy milk. They provide a delicious creaminess without compromising on flavor.
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Adjust seasonings to taste: Everyone’s palate is different! Feel free to taste and adjust the salt, herbs, or even cheese according to your preference for a personal touch.
How to Serve Best Ever Caramelized Onion Mashed Potatoes
These caramelized onion mashed potatoes are not just a side dish; they’re a centerpiece! Here’s how you can present this delightful dish beautifully.
Garnishes
- Chopped parsley: A sprinkle of fresh chopped parsley adds a pop of color and freshness that brightens up the dish.
- Crispy shallots: For an extra crunch and depth of flavor, top with some crispy shallots—this contrast in texture is sure to impress!
- Olive oil drizzle: A gentle drizzle of high-quality olive oil right before serving can enhance the richness of the mashed potatoes.
Side Dishes
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Roasted Brussels sprouts: These little greens are roasted until crispy on the outside and tender on the inside. Their nutty flavor complements the sweetness of the caramelized onions perfectly.
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Garlic sautéed green beans: Bright green beans sautéed with garlic offer a fresh crunch that balances out the creamy potatoes nicely while adding vibrant color to your plate.
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Grilled vegetable medley: A mix of seasonal vegetables grilled to perfection provides both flavor and nutrition. The smoky char enhances every bite alongside your rich mashed potatoes.
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Herb-crusted baked chicken: Juicy chicken seasoned with fresh herbs pairs beautifully with these mashed potatoes for a comforting meal that feels indulgent yet wholesome.
Now you’re ready to serve up these delicious Best Ever Caramelized Onion Mashed Potatoes! Enjoy every creamy bite at your next gathering or cozy dinner.

Make Ahead and Storage
One of the best things about the Best Ever Caramelized Onion Mashed Potatoes is how perfect they are for meal prep! You can easily make them in advance, ensuring you have a delicious side dish ready to go for any occasion. Here’s how to store and reheat them:
Storing Leftovers
- Store any leftover mashed potatoes in an airtight container.
- Keep them in the refrigerator for up to 3-5 days.
- If possible, separate the caramelized onions from the mashed potatoes to maintain their texture.
Freezing
- Allow the mashed potatoes to cool completely before freezing.
- Portion them into freezer-safe bags or containers, leaving some space for expansion.
- Label with the date and freeze for up to 2 months.
Reheating
- Thaw overnight in the refrigerator if frozen.
- Reheat in a pot over low heat, adding a splash of milk or broth to restore creaminess.
- Stir frequently until heated through; you can also microwave them in short intervals.
FAQs
Here are some frequently asked questions about the Best Ever Caramelized Onion Mashed Potatoes:
Can I use other types of potatoes for this recipe?
While Yukon Gold potatoes are recommended for their creamy texture, you can experiment with other varieties like Russet or red potatoes. Just keep in mind that flavor and consistency may vary slightly.
How can I make these Best Ever Caramelized Onion Mashed Potatoes dairy-free?
To make this recipe dairy-free, simply substitute regular butter with non-dairy butter and use full-fat coconut milk or another plant-based milk instead of half & half. The flavors will still be delicious!
What can I serve with Best Ever Caramelized Onion Mashed Potatoes?
These mashed potatoes pair beautifully with roasted meats, grilled vegetables, or as part of a hearty vegetarian meal. They’re versatile enough to complement many dishes!
Final Thoughts
I hope you feel inspired to try making these Best Ever Caramelized Onion Mashed Potatoes! They truly elevate any meal with their rich flavors and comforting texture. Whether it’s a festive gathering or a cozy weeknight dinner, these mashed potatoes will surely impress your family and friends. Enjoy every creamy bite, and don’t hesitate to share your creations! Happy cooking!
Best Ever Caramelized Onion Mashed Potatoes
Elevate your dinner table with these Best Ever Caramelized Onion Mashed Potatoes. This creamy, decadent side dish combines the sweetness of caramelized onions with the earthiness of fresh herbs, creating a flavor experience that will leave everyone wanting more. Perfect for busy weeknights or festive gatherings, these mashed potatoes are not just a side; they are a comforting centerpiece that pairs wonderfully with a variety of main dishes. With easy preparation and family-friendly appeal, you can whip them up in under 90 minutes, making them a go-to choice for any occasion.
- Prep Time: 20 minutes
- Cook Time: 70 minutes
- Total Time: 1 hour 30 minutes
- Yield: Makes 8 servings 1x
- Category: Side Dish
- Method: Boiling
- Cuisine: American
Ingredients
- 2 Tablespoons Olive Oil
- 4 Yellow Onions, sliced thin
- 2 Pounds Yukon Gold Potatoes, washed
- 4 Tablespoons Salted Butter or non-dairy butter
- 3/4 Cup Half & Half or Full-Fat Coconut Milk or Dairy-Free Milk
- 1 Teaspoon Kosher Salt
- 1 Cup Parmesan Cheese, freshly grated
- 1 Bunch Chives, thinly chopped
- 2 Sprigs Fresh Thyme
- 3 Leaves Fresh Sage, chopped
Instructions
- Prepare the onions by peeling and thinly slicing them.
- In a skillet over medium heat, add olive oil and sliced onions. Cook for 40-50 minutes, stirring occasionally until golden brown and caramelized.
- Meanwhile, wash and chop Yukon Gold potatoes into small pieces. Boil in salted water for about 20 minutes until fork-tender.
- Drain the cooked potatoes and mash in a large bowl. Add butter, half & half (or dairy-free alternative), and kosher salt, mixing until smooth.
- Stir in half of the caramelized onions and Parmesan cheese until well combined.
- Serve the mashed potatoes topped with remaining caramelized onions and sprinkle with chopped chives, thyme, and sage.
Nutrition
- Serving Size: 1 cup (240g)
- Calories: 280
- Sugar: 3g
- Sodium: 400mg
- Fat: 12g
- Saturated Fat: 7g
- Unsaturated Fat: 4g
- Trans Fat: 0g
- Carbohydrates: 39g
- Fiber: 4g
- Protein: 6g
- Cholesterol: 30mg
