Sweet caramelized onions paired with creamy mashed potatoes create the perfect comfort food dish. This combination brings together the rich, buttery flavor of mashed potatoes and the slightly sweet, savory goodness of caramelized onions. It’s an easy-to-make side dish that elevates any meal, from casual weeknight dinners to festive holiday gatherings.

Why You’ll Love This Recipe

• A perfect balance of sweet and savory flavors.
• A versatile side dish that pairs well with roasted meats, grilled vegetables, or seafood.
• Simple ingredients but big on flavor.
• Ideal for meal prep or holiday feasts.
• Comforting, hearty, and satisfying for any occasion.

Ingredients

(Tip: You can find the complete list of ingredients and their measurements in the recipe card below.)

For the Caramelized Onions:

• Yellow or sweet onions (thinly sliced)
• Butter
• Olive oil
• Sugar (optional, for extra sweetness)
• Balsamic vinegar (optional, for added depth)
• Salt

For the Creamy Mashed Potatoes:

• Yukon Gold or Russet potatoes (peeled and cubed)
• Butter
• Heavy cream or whole milk
• Garlic (optional, for added flavor)
• Salt and pepper

Directions

Step 1: Caramelize the Onions

1. Heat butter and olive oil in a large skillet over medium heat.
2. Add the sliced onions and a pinch of salt. Cook, stirring frequently, for 25–30 minutes until the onions are golden brown and caramelized. Lower the heat if they start to brown too quickly.
3. For extra sweetness, sprinkle a little sugar halfway through the cooking process. If desired, deglaze the pan with balsamic vinegar for a richer flavor. Set aside when done.

Step 2: Prepare the Mashed Potatoes

1. Place the cubed potatoes in a large pot and cover them with cold, salted water. Bring to a boil and cook for 15–20 minutes, or until the potatoes are fork-tender.
2. Drain the potatoes and return them to the pot. Add butter, heavy cream (or milk), and garlic if using. Mash until smooth and creamy. Adjust with more cream or butter for your desired consistency. Season with salt and pepper to taste.

Step 3: Combine and Serve

1. Spoon the mashed potatoes into a serving bowl. Top generously with the caramelized onions.
2. Serve immediately as a side dish or enjoy on its own for a comforting treat.

Servings and Timing

• Servings: 4–6
• Prep Time: 10 minutes
• Cook Time: 35 minutes
• Total Time: 45 minutes

Variations

• Cheesy Mashed Potatoes: Stir in grated Parmesan or shredded cheddar cheese for added richness.
• Herb-Infused Onions: Add thyme or rosemary to the caramelized onions for a fragrant touch.
• Loaded Mashed Potatoes: Top with crumbled bacon, sour cream, and green onions alongside the caramelized onions.
• Vegan Option: Use plant-based butter and non-dairy milk for the mashed potatoes.
• Roasted Garlic Mash: Roast a head of garlic and mix the cloves into the mashed potatoes for extra depth of flavor.

Storage/Reheating

• Storage: Store leftovers in an airtight container in the refrigerator for up to 3 days.
• Reheating: Reheat in the microwave or over low heat in a saucepan, adding a splash of milk or cream to restore creaminess.
• Freezing: Mashed potatoes freeze well. Place in a freezer-safe container and freeze for up to 2 months. Thaw in the fridge and reheat before serving.

FAQs

1. Can I use red onions instead of yellow onions?

Yes, red onions work well and add a slightly different sweetness to the caramelized onions.

2. How do I prevent the onions from burning?

Cook them over low to medium heat and stir frequently. Add a splash of water if the pan gets too dry.

3. Can I make this recipe dairy-free?

Yes, use dairy-free butter and plant-based milk for a creamy but dairy-free alternative.

4. What potatoes are best for mashed potatoes?

Yukon Gold or Russet potatoes are the best choices for a fluffy and creamy texture.

5. Can I make the caramelized onions ahead of time?

Yes, caramelized onions can be stored in the fridge for up to 5 days. Reheat gently before using.

6. How do I make the mashed potatoes extra smooth?

For ultra-smooth mashed potatoes, use a potato ricer or food mill instead of a traditional masher.

7. Can I add other vegetables to the mashed potatoes?

Yes, mix in roasted cauliflower, parsnips, or sweet potatoes for extra flavor and nutrients.

8. What can I pair with this dish?

This side pairs beautifully with roast chicken, beef, pork chops, or salmon.

9. Can I make this recipe in advance?

You can prepare the mashed potatoes and onions ahead of time. Store them separately and reheat when ready to serve.

10. What’s the secret to perfect caramelized onions?

Patience! Slow cooking over low heat is key to achieving deeply caramelized, sweet onions.

Conclusion

Sweet Caramelized Onions and Creamy Mashed Potatoes is a dish that transforms simple ingredients into a luxurious and comforting side. The natural sweetness of the onions paired with the buttery, smooth potatoes creates a perfect harmony of flavors. Whether served alongside a holiday roast or as part of a cozy dinner, this recipe is sure to impress. Give it a try, and it just might become a new family favorite!