Indulge in the comforting embrace of this potato casserole, where creamy mashed potatoes meet the tangy zest of sour cream and onion, crowned with a golden, cheesy, and crunchy chip topping. A symphony of textures and flavors that will elevate any meal.

Follow The Directions

01

Step

Gather all ingredients. (5 minutes)

02

Step

Preheat the oven to 375 degrees F (190 degrees C). Combine potatoes and 1 tablespoon salt in a 6 to 8-quart pot; cover with water. Bring to a boil over high heat. Reduce heat to medium and simmer for 25 minutes, or until very tender. (35 minutes)

03

Step

Meanwhile, heat olive oil in a large skillet over medium heat. (2 minutes)

04

Step

Add onions, garlic, sugar, and vinegar to the skillet. Cook onion mixture 20 minutes, stirring occasionally, or until onions are tender and caramelized, adding water 1 tablespoon at a time, as needed to prevent sticking. Reserve. (20 minutes)

05

Step

Once potatoes are cooked; drain and return to the pot. Turn heat to high; cook and stir potatoes for 30 seconds to help remove extra cooking liquid from potatoes. Remove from heat. (2 minutes)

06

Step

Add remaining 1 1/2 teaspoon salt, sour cream, buttermilk, butter, and black pepper to the potatoes. (3 minutes)

07

Step

Mash with a potato masher until smooth and fluffy. (5 minutes)

08

Step

Add cooked onion mixture, green onions, and chives to the potato mixture; stir to combine. (3 minutes)

09

Step

Spread in a 2-quart baking dish. Sprinkle with cheese and potato chips. (5 minutes)

10

Step

Bake until cheese is melted, about 20 minutes. (20 minutes)

11

Step

Garnish with additional chopped fresh chives. (2 minutes)

For an extra layer of flavor, try using a mix of different cheeses, such as Gruyere or Monterey Jack.
If you don't have buttermilk on hand, you can substitute with regular milk mixed with a tablespoon of lemon juice or vinegar.
The caramelized onions are key to the depth of flavor in this casserole, so don't rush the process. Allow them to develop a rich, golden-brown color.
Feel free to adjust the amount of sour cream and onion chips to your liking. Some people prefer a more subtle flavor, while others enjoy a bolder taste.
This casserole can be assembled ahead of time and baked just before serving. Simply cover it tightly with plastic wrap and refrigerate for up to 24 hours.