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Buttermilk Ranch Potatoes au Gratin
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5 from 3 votes

Buttermilk Ranch Potatoes au Gratin

Buttermilk Ranch Potatoes au Gratin is a tangy twist on the classic comforting side dish with tender potatoes bathed in a rich creamy sauce seasoned boldly with ranch, under a crust of browned cheese.
Prep Time5 mins
Cook Time1 hr 40 mins
Total Time1 hr 45 mins
Course: Side Dish
Cuisine: American
Servings: 6
Calories: 375kcal


  • 2 lbs russet potatoes, peeled
  • 3 tbsp butter
  • 3 tbsp all-purpose flour
  • 2 cups buttermilk
  • 1 oz ranch seasoning packet
  • 1 ½ cup shredded mild cheddar cheese, divided
  • teaspoon pepper
  • salt to taste


  • Preheat oven to 375 degrees.
  • Grease the inside of a 2 quart baking dish with cooking spray or butter.
  • Slice potatoes into ¼" thick rounds and layer flat in the baking dish.
  • In saucepan on medium-low heat melt butter and add flour to form a roux. Whisk continually for 5 minutes to prevent roux from burning.
  • When the roux begins to deepen in color add buttermilk slowly, mixing to combine as you pour.
  • Add ranch seasoning and black pepper to taste.
  • Slowly add ¾ cups shredded cheddar cheese in batches, ensuring each batch fully melts before more is added.
  • Continue to cook until the mixture thickens slightly, taste and add salt only if needed.
  • Pour sauce over potatoes in the baking dish, cover with foil and place in the oven for 1 hour.
  • Uncover potatoes, add remaining ¾ cup of cheese and bake 25-30 more minutes. Cheese should be nicely browned.
  • Remove from oven and let cool for 5 minutes before serving.


Calories: 375kcal