Go Back

Mashed Long Island Potato Casserole

Print Recipe
Prep Time 15 minutes
Cook Time 1 hour 45 minutes
Course: Side Dish
Ingredients Method

Ingredients
  

  • 4 lbs russet potatoes, peeled and cut into 1-inch chunks
  • 1/2 cup half-and-half
  • 1/2 cup low-sodium chicken broth
  • 12 tbsp unsalted butter (1 1/2 sticks), cut into pieces
  • 1 clove garlic, minced
  • 2 tsp Dijon mustard
  • 2 tsp salt
  • 4 large eggs
  • 1/4 cup finely chopped fresh chives

Method
 

  1. Adjust oven rack to upper-middle position and heat oven to 375 degrees. Bring potatoes and water to cover by 1 inch to boil in large pot over high heat. Reduce heat to medium and simmer until potatoes are tender, about 20 minutes.
  2. Heat half-and-half, broth, butter, garlic, mustard, and salt in saucepan over medium-low heat until smooth, about 5 minutes. Keep warm.
  3. Drain potatoes and transfer to large bowl. With electric mixer on medium-low speed, beat potatoes, slowly adding half-and-half mixture, until smooth and creamy, about 1 minute. Scrape down bowl; beat in eggs 1 at a time until incorporated, about 1 minute. Fold in chives.
  4. Transfer potato mixture to greased 3-quart baking dish. Bake until potatoes rise and begin to brown, about 35 minutes. Let cool 10 minutes. 
Make ahead:
  1. The baking dish with the potatoes can be covered with plastic and refrigerated for up to 24 hours.
  2. When ready to bake, let the casserole sit at room temperature for 1 hour. Increase baking time by 10 minutes.