Caramelized French Onion Mashed Potatoes with Gruyere
Rich and creamy mashed potatoes with deeply caramelized onions and melted Gruyere cheese. The onions are slowly cooked for an hour until golden brown and sweet, then mixed with classic French onion flavors like Worcestershire sauce and balsamic vinegar. Perfect as a luxurious side dish for holidays, dinner parties, or whenever you want to transform ordinary mashed potatoes into something special. The combination of sweet caramelized onions and nutty Gruyere creates a sophisticated twist on the comfort food classic.
Ingredients
- 1 tablespoon oil
- 2 pounds onions, slicedshallots1:1vegetarian
milder flavor
- 1 cup beef brothvegetable broth1:1vegetarianFull guide →
- 1 clove garlic, chopped
- ½ teaspoon thyme, chopped
- 1 teaspoon worcestershire sauce
- 1 teaspoon balsamic vinegar
- 1 teaspoon soy sauce
- 3 pounds russet potatoes, peeled and cut into 2 inch cubes
- 4 cloves garlic, peeled
- ¼ cup butter, melted
- ¼ cup cream, room temperature
- 1 cup gruyere, shredded
Instructions
- 1
Heat oil in large pan over medium heat
- 2
Add onions and cook stirring until deep brown caramelized about 60 minutes
- 3
Add splash of broth when brown bits form on bottom of pan scraping them up as broth sizzles
- 4
Add garlic and thyme and cook until fragrant about a minute
- 5
Add worcestershire sauce balsamic vinegar and soy sauce and cook for a minute
- 6
Place potatoes and garlic in large pot and cover in water
- 7
Bring to boil and cook until tender about 15-20 minutes
- 8
Drain potatoes and garlic well
- 9
Mash by hand and mix in caramelized onions butter cream and gruyere
- 10
Let cheese melt
Tips
Use a splash of broth to deglaze the pan when caramelizing onions to prevent burning and capture all the flavorful brown bits.
Let the cheese melt naturally from the heat of the potatoes rather than returning to heat to maintain smooth texture.
Cut potatoes into uniform 2-inch pieces for even cooking and better mashing consistency.
Good to Know
Refrigerate for up to 3 days in covered container. Reheat gently with splash of cream or milk.
Can caramelize onions up to 2 days ahead. Assemble day of serving for best texture.
Serve hot as side dish with roasted meats or holiday meals.
Common Mistakes
Don't rush caramelizing onions to avoid bitter flavor instead of sweet depth.
Drain potatoes thoroughly to prevent watery mashed potatoes.
Let cheese melt from residual heat to avoid breaking or becoming stringy.
Substitutions
Dairy-Free Swaps
General Alternatives
milder flavor
FAQ
Can I make these ahead of time?
You can caramelize the onions up to 2 days ahead, but assemble the final dish day of serving for best texture and flavor.
What if I don't have Gruyere cheese?
Swiss cheese works well as a substitute with similar nutty flavor, or try sharp cheddar for a different but delicious variation.
How long will leftovers keep?
Store covered in refrigerator for up to 3 days. Reheat gently with a splash of cream or milk to restore creamy texture.