These Best Ever Caramelized Onion Mashed Potatoes are a delightful twist on the classic comfort food. With a mix of buttery caramelized onions, creamy potatoes, and fresh herbs, they offer a unique flavor profile that elevates any meal. Perfect for holiday gatherings or cozy family dinners, this recipe will surely become a favorite.
Why You’ll Love This Recipe
- Flavor Explosion: The rich taste of caramelized onions combined with creamy potatoes creates an unforgettable dish.
- Versatile Side Dish: These mashed potatoes pair well with roasted meats, grilled vegetables, or can be enjoyed on their own.
- Easy to Make: Despite the gourmet taste, the recipe is straightforward and requires only basic cooking skills.
- Herb-Infused Goodness: Fresh thyme and sage add aromatic depth to the dish, making it extra special.
- Perfect for Any Occasion: Be it Thanksgiving or a casual dinner, these mashed potatoes fit right in.
Tools and Preparation
Before diving into the recipe, gather your tools to ensure a smooth cooking process.
Essential Tools and Equipment
- Large pot
- Skillet
- Potato masher
- Cutting board
- Chef’s knife
Importance of Each Tool
- Large pot: Essential for boiling the potatoes evenly and ensuring they reach the perfect tenderness.
- Skillet: Ideal for caramelizing onions slowly to achieve maximum flavor without burning.
- Potato masher: Makes it easy to achieve that creamy consistency without lumps.

Ingredients
- 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)
How to Make Best Ever Caramelized Onion Mashed Potatoes
Step 1: Prepare the Onions
Start by peeling the skin from the onions and thinly slicing them. It may seem like a lot of onions, but this will contribute to the delicious flavor!
Step 2: Caramelize the Onions
Heat a skillet over medium heat and add in the olive oil. Once hot:
1. Add the sliced onions.
2. Stir occasionally until browned and caramelized, which should take about 40–50 minutes.
Step 3: Cook the Potatoes
While the onions are caramelizing:
1. Wash the Yukon Gold potatoes thoroughly.
2. Chop them into small pieces (peeling is optional).
3. In a large pot of boiling water, cook the chopped potatoes for about 20 minutes until fork-tender.
Step 4: Mash the Potatoes
Once cooked:
1. Drain the water from the pot.
2. Use a potato masher to mash the potatoes until smooth.
Step 5: Mix in Ingredients
To create creamy mashed potatoes:
1. Add in salted butter, kosher salt, and half & half (or coconut milk).
2. Mash again until fully combined.
Step 6: Combine with Onions and Cheese
Once your onions are caramelized:
1. Remove half of them from the skillet and add them to your mashed potatoes along with Parmesan cheese.
2. Stir to incorporate all ingredients evenly.
Step 7: Serve with Toppings
Transfer your mashed potatoes to a large serving bowl:
1. Top with remaining caramelized onions.
2. Garnish with chopped chives, thyme, sage, and melted butter before serving.
Enjoy your rich and flavorful Best Ever Caramelized Onion Mashed Potatoes, perfect for any gathering!
How to Serve Best Ever Caramelized Onion Mashed Potatoes
These Best Ever Caramelized Onion Mashed Potatoes are a delicious side dish that can complement a variety of meals. Whether you’re hosting a holiday gathering or a casual dinner, here are some serving suggestions to elevate your presentation.
For Holiday Gatherings
- Festive Platter: Serve in a large bowl garnished with fresh herbs and extra caramelized onions for an eye-catching centerpiece.
- Individual Portions: Use ramekins for single servings; it makes for a charming and elegant presentation.
With Grilled Meats
- Steak Pairing: These mashed potatoes pair beautifully with grilled steak, providing a creamy contrast to the rich flavors.
- Herb-Rubbed Chicken: Serve alongside herb-rubbed chicken for a comforting and hearty meal.
As Part of a Vegetarian Feast
- Roasted Vegetables: Accompany with an assortment of roasted vegetables for a vibrant and colorful plate.
- Stuffed Peppers: Serve alongside stuffed peppers filled with quinoa and veggies for a satisfying vegetarian option.
How to Perfect Best Ever Caramelized Onion Mashed Potatoes
To make your Best Ever Caramelized Onion Mashed Potatoes even better, consider these helpful tips. A few simple adjustments can enhance the flavor and texture of this classic dish.
- Bold Flavoring: Use fresh herbs like thyme and sage to enhance the taste. They add depth and aroma to the mashed potatoes.
- Creamy Consistency: For ultra-creamy potatoes, use full-fat coconut milk or half & half. Adjust the amount based on desired creaminess.
- Properly Caramelize Onions: Take your time with caramelizing onions. The longer they cook, the sweeter and more flavorful they become.
- Adjust Seasoning: Taste before serving. Add more salt or pepper as needed to achieve your perfect flavor balance.
- Use Warm Ingredients: Ensure that butter and milk are warm before mixing them into the potatoes. This helps maintain a smooth texture.
Best Side Dishes for Best Ever Caramelized Onion Mashed Potatoes
Pairing side dishes with your Best Ever Caramelized Onion Mashed Potatoes can create a well-rounded meal. Here are some fantastic options:
- Grilled Lemon Chicken: The zesty flavor complements the richness of the mashed potatoes.
- Roasted Brussels Sprouts: Their slight bitterness balances the creamy potatoes perfectly.
- Maple-Glazed Carrots: Sweet glazed carrots add color and contrast to your plate.
- Garlic Green Beans: Crisp green beans sautéed with garlic offer freshness alongside the creamy texture.
- Stuffed Acorn Squash: A healthy vegetarian option filled with grains, nuts, and dried fruits pairs well with the hearty potatoes.
- Cauliflower Steaks: Roasted cauliflower steaks bring out nutty flavors that harmonize with mash’s creaminess.
Common Mistakes to Avoid
When making the Best Ever Caramelized Onion Mashed Potatoes, a few common mistakes can lead to less-than-perfect results. Here are some pitfalls to avoid:
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Boldly slicing onions unevenly: If your onions are not sliced evenly, they will cook at different rates. Aim for uniform slices for consistent caramelization.
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Boldly rushing the onion caramelization: Caramelizing onions requires patience. Cooking them too quickly will result in burnt edges instead of sweet, golden goodness. Allow about 40-50 minutes on medium heat.
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Boldly using cold ingredients: Adding cold butter or milk straight from the fridge can cool down your mashed potatoes. Make sure all ingredients are at room temperature for a creamy texture.
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Boldly over-mashing the potatoes: Over-mashing can lead to gluey potatoes. Mash just until combined and smooth to maintain the ideal fluffy consistency.
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Boldly forgetting seasoning: Under-seasoned potatoes can taste bland. Be sure to add enough salt and taste as you go to enhance flavors.

Storage & Reheating Instructions
Refrigerator Storage
- Store leftovers in an airtight container.
- Best consumed within 3-5 days for optimal freshness.
Freezing Best Ever Caramelized Onion Mashed Potatoes
- Use freezer-safe containers or heavy-duty freezer bags.
- Can be frozen for up to 2 months; label with the date for reference.
Reheating Best Ever Caramelized Onion Mashed Potatoes
-
Oven: Preheat to 350°F (175°C). Transfer potatoes to a baking dish, cover with foil, and heat for about 20-30 minutes.
-
Microwave: Place in a microwave-safe bowl, cover with a damp paper towel, and heat in 1-minute intervals until warm.
-
Stovetop: Heat over low flame in a saucepan, stirring frequently to prevent sticking. Add a splash of broth or milk if needed for moisture.
Frequently Asked Questions
Here are some common questions about the Best Ever Caramelized Onion Mashed Potatoes:
What makes these mashed potatoes the best ever?
These mashed potatoes stand out due to the rich flavor of caramelized onions combined with creamy textures from butter and cheese. Each bite bursts with savory goodness!
Can I make this recipe dairy-free?
Absolutely! Substitute regular butter and half & half with non-dairy alternatives like vegan butter and full-fat coconut milk for delicious results.
How do I customize my Best Ever Caramelized Onion Mashed Potatoes?
Feel free to add your favorite herbs or mix in roasted garlic for an extra layer of flavor. You can also experiment with different cheeses!
Can I prepare these mashed potatoes ahead of time?
Yes! You can prepare them ahead of time and reheat when ready to serve. This is great for holiday meals or gatherings.
Final Thoughts
The Best Ever Caramelized Onion Mashed Potatoes are a delightful twist on a classic side dish that brings comfort and flavor to any meal. Their creamy texture paired with sweet caramelized onions makes them irresistible. Feel free to customize them with your favorite herbs or ingredients, ensuring they suit your taste perfectly!
Best Ever Caramelized Onion Mashed Potatoes
Indulge in the rich flavors of our Best Ever Caramelized Onion Mashed Potatoes. This scrumptious side dish transforms classic mashed potatoes into a gourmet experience, thanks to the sweet, buttery caramelized onions and a hint of fresh herbs. Perfect for any occasion, from festive holiday meals to casual family dinners, these mashed potatoes are creamy, flavorful, and sure to impress your guests. Elevate your dining experience with this easy yet elegant recipe that combines comfort food with a touch of sophistication.
- Prep Time: 15 minutes
- Cook Time: 70 minutes
- Total Time: 1 hour 25 minutes
- Yield: Serves 6
- Category: Side Dish
- Method: Boiling and Sautéing
- Cuisine: American
Ingredients
- 2 Tablespoons Olive Oil
- 4 Yellow Onions (sliced thin and evenly)
- 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 (stems removed)
- 3 Leaves Fresh Sage (chopped)
Instructions
- Prepare onions by peeling and slicing them thinly.
- In a skillet over medium heat, heat olive oil and add sliced onions. Cook for 40-50 minutes until they are caramelized and golden brown.
- Meanwhile, wash and chop the Yukon Gold potatoes into small pieces. Boil in a large pot of water for about 20 minutes until fork-tender.
- Drain the potatoes and mash them until smooth using a potato masher.
- Mix in salted butter, kosher salt, and half & half (or coconut milk) until creamy.
- Combine half of the caramelized onions with the mashed potatoes along with Parmesan cheese.
- Serve in a bowl topped with remaining caramelized onions and garnish with chopped chives, thyme, sage, and melted butter.
Nutrition
- Serving Size: 1 cup (240g)
- Calories: 320
- Sugar: 3g
- Sodium: 600mg
- Fat: 15g
- Saturated Fat: 7g
- Unsaturated Fat: 8g
- Trans Fat: 0g
- Carbohydrates: 42g
- Fiber: 4g
- Protein: 6g
- Cholesterol: 30mg


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