Best Ever Caramelized Onion Mashed Potatoes
There is no dish that is more quintessential to American cooking than mashed potatoes. Think: creamy, cheesy, smooth potatoes often topped with chives, fresh herbs, and a whole lot of butter. My version of mashed potatoes isn’t your typical recipe – after all, they aren’t called the Best Ever Caramelized Onion Mashed Potatoes for nothing! These potatoes are loaded with fresh herbs and topped with buttery caramelized onions, making them perfect for any occasion, from casual dinners to festive gatherings.
Why You’ll Love This Recipe
- Irresistible Flavor: The combination of caramelized onions and rich cheese creates a depth of flavor that elevates traditional mashed potatoes.
- Versatile Side Dish: Perfectly complements any main course—be it chicken, turkey, or vegetables—making it a crowd-pleaser.
- Easy to Prepare: With straightforward steps, you’ll be enjoying a delicious dish in no time.
- Healthy Twist: Packed with nutrients from Yukon Gold potatoes and fresh herbs, this dish balances indulgence with health.
- Adaptable Ingredients: Swap in your favorite dairy-free options without sacrificing taste or creaminess.
Tools and Preparation
Before diving into the recipe, gather your tools to make the cooking process smooth and enjoyable.
Essential Tools and Equipment
- Skillet
- Pot
- Potato masher
- Knife
- Cutting board
Importance of Each Tool
- Skillet: A good skillet ensures even cooking and browning of onions for perfect caramelization.
- Pot: A sturdy pot allows for boiling potatoes efficiently without risk of overflow.
- Potato masher: A quality masher helps achieve the desired creamy texture 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. Though it may seem like a lot of onions, trust the process!
Step 2: Caramelize the Onions
- Heat a skillet over medium heat and add olive oil.
- Once hot, add in the sliced onions.
- Stir occasionally until the onions are browned and caramelized; this will take about 40–50 minutes.
Step 3: Cook the Potatoes
- While the onions are cooking, wash the Yukon Gold potatoes thoroughly.
- Chop them into small pieces (leave skins on for texture).
- In a pot, bring water to a rolling boil and add in the chopped potatoes.
- Cook for about 20 minutes until fork-tender.
Step 4: Mash the Potatoes
- Drain water from cooked potatoes.
- Use a potato masher to mash them until smooth.
Step 5: Add Creaminess
- Stir in butter, kosher salt, and half & half (or coconut milk).
- Mash again until fully combined.
Step 6: Combine Onions and Cheese
- Once fully caramelized, remove half of the onions from skillet.
- Mix remaining onions into mashed potatoes along with parmesan cheese.
Step 7: Final Touches
- Transfer mashed potatoes to a serving bowl.
- Top with remaining caramelized onions, chopped chives, thyme, sage, and melted butter.
- Serve immediately and enjoy your delicious Best Ever Caramelized Onion Mashed Potatoes!
This dish serves eight people—a perfect addition to any meal!
How to Serve Best Ever Caramelized Onion Mashed Potatoes
These delicious mashed potatoes are perfect for any occasion. Their creamy texture and rich flavor pair well with a variety of dishes, making them a versatile side.
Family Gatherings
- Serve the mashed potatoes family-style in a large bowl for everyone to help themselves. This creates a warm, inviting atmosphere during meals.
Holiday Dinners
- These mashed potatoes are ideal for Thanksgiving or Christmas feasts, especially when topped with extra caramelized onions and fresh herbs.
Barbecues
- Pair them with grilled chicken or turkey for a delightful contrast in flavors. The richness of the potatoes complements smoky meats perfectly.
Casual Weeknight Meals
- Enjoy them with simple proteins like baked chicken or beef, making weeknight dinners feel special without much effort.
Potlucks
- Bring these mashed potatoes to potlucks as they are sure to impress guests. They can be easily transported in a slow cooker to keep them warm.
How to Perfect Best Ever Caramelized Onion Mashed Potatoes
Achieving the best texture and flavor in your mashed potatoes is easy with a few simple tips.
- Choose the right potatoes: Yukon Golds are ideal for their creamy texture and buttery flavor.
- Don’t rush caramelizing onions: Take your time; slow cooking enhances their sweetness and depth of flavor.
- Use warm ingredients: Adding warm butter and milk helps maintain the desired creamy consistency.
- Mash gently: Avoid over-mashing, which can lead to gluey potatoes. Use a potato masher or ricer for the best results.
- Season well: Adjust salt and pepper according to taste after mixing all ingredients for balanced flavor.
Best Side Dishes for Best Ever Caramelized Onion Mashed Potatoes
These mashed potatoes complement numerous side dishes beautifully. Here are some great options to consider:
-
Garlic Green Beans
Tender green beans sautéed with garlic add crunch and freshness alongside the rich potatoes. -
Roasted Brussels Sprouts
Caramelized Brussels sprouts provide another layer of sweetness that pairs wonderfully with the onion flavor. -
Honey Glazed Carrots
Sweet, tender carrots glazed with honey bring brightness and color to your plate. -
Creamed Spinach
This classic dish adds a creamy, savory element that contrasts nicely with the rich mashed potatoes. -
Herb-Roasted Chicken
Juicy roasted chicken seasoned with fresh herbs makes a delightful main course next to these flavorful potatoes. -
Grilled Asparagus
Lightly charred asparagus spears add a smoky touch that complements the creaminess of the mashed potatoes. -
Stuffed Bell Peppers
Colorful bell peppers filled with rice, vegetables, or meat offer an enticing visual appeal alongside your dish. -
Cauliflower Steaks
Thick slices of roasted cauliflower seasoned well provide a hearty yet healthy option that pairs nicely with the carbs from the potatoes.
Common Mistakes to Avoid
Making mashed potatoes can be simple, but a few common mistakes can lead to less-than-perfect results. Here’s what to watch out for:
- Bold Preparation: Not slicing the onions evenly can lead to uneven cooking. Ensure all onion slices are uniform to achieve consistent caramelization.
- Bold Potato Selection: Using the wrong type of potato can affect texture. Stick with Yukon Gold potatoes for creaminess and flavor.
- Bold Overcooking: Cooking the potatoes too long can make them watery. Boil just until fork-tender for the best texture.
- Bold Skipping Seasoning: Forgetting to season at different stages can leave your dish bland. Add salt while mashing and before serving for enhanced flavor.
- Bold Ignoring Texture: Mashing too vigorously can create gummy potatoes. Mash gently until smooth for the ideal consistency.

Storage & Reheating Instructions
Refrigerator Storage
- Store in an airtight container in the fridge.
- Best consumed within 3-5 days for optimal freshness.
Freezing Best Ever Caramelized Onion Mashed Potatoes
- Freeze in a freezer-safe container or zip-top bag.
- Can be stored for up to 2 months.
Reheating Best Ever Caramelized Onion Mashed Potatoes
- Oven: Preheat to 350°F (175°C) and bake covered for about 20 minutes until heated through.
- Microwave: Heat in short bursts, stirring in between, until warm.
- Stovetop: Reheat over low heat, adding a splash of milk or broth to maintain creaminess.
Frequently Asked Questions
Here are some common questions related to the Best Ever Caramelized Onion Mashed Potatoes:
Can I use another type of cheese?
You can substitute with other cheeses like cheddar or Gruyère for different flavors.
How do I make these mashed potatoes vegan?
Use non-dairy butter and coconut milk instead of regular butter and half & half.
What is the best way to caramelize onions?
Cook them slowly over medium heat, stirring occasionally, until golden brown and sweet.
Can I add other herbs?
Absolutely! Feel free to mix in herbs like rosemary or parsley to customize your flavor profile.
Final Thoughts
These Best Ever Caramelized Onion Mashed Potatoes offer a delightful twist on a classic dish. The caramelized onions provide depth and sweetness, making them perfect for any occasion. Experiment with different herbs or cheese types for a personalized touch you’ll love!
Best Ever Caramelized Onion Mashed Potatoes
Indulge in the ultimate comfort food with these Best Ever Caramelized Onion Mashed Potatoes. This delightful twist on classic mashed potatoes features creamy Yukon Golds enriched with buttery caramelized onions and a medley of fresh herbs. Perfect for family gatherings, holiday dinners, or casual weeknight meals, this dish is sure to impress your guests and elevate any main course. With its irresistible flavor and smooth texture, these mashed potatoes are not only delicious but also easy to prepare. Whether you choose to make them vegan or stick with traditional ingredients, this recipe offers versatility without compromising taste.
- Prep Time: 15 minutes
- Cook Time: 70 minutes
- Total Time: 1 hour 25 minutes
- Yield: Serves 8
- Category: Side Dish
- Method: Boiling/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 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)
Instructions
- Peel and thinly slice the onions. Heat olive oil in a skillet over medium heat; add onions and cook until caramelized (about 40–50 minutes).
- Wash and chop Yukon Gold potatoes into small pieces. Boil in salted water for about 20 minutes until fork-tender.
- Drain potatoes, then mash until smooth. Stir in butter, kosher salt, and half & half (or coconut milk) until well combined.
- Mix in half of the caramelized onions and parmesan cheese.
- Transfer to a serving bowl, top with remaining onions, chopped chives, thyme, sage, and melted butter.
Nutrition
- Serving Size: 1 cup (240g)
- Calories: 350
- Sugar: 3g
- Sodium: 600mg
- Fat: 18g
- Saturated Fat: 9g
- Unsaturated Fat: 7g
- Trans Fat: 0g
- Carbohydrates: 45g
- Fiber: 5g
- Protein: 6g
- Cholesterol: 30mg