Nani's Mashed Potato Casserole


I got this instant mashed potato casserole recipe from my ex-wife's mother. People absolutely beg her to make this for family dinners and potlucks. It's so simple, she'll often just give them the recipe. The only thing bad about this recipe is there are never any leftovers!

Prep Time:
15 mins
Cook Time:
20 mins
Total Time:
35 mins


  • 2 cups water

  • ¼ cup butter

  • 2 teaspoons instant minced onion

  • 2 teaspoons dried parsley

  • 1 teaspoon salt

  • teaspoon ground thyme

  • 1 cup milk

  • 3 cups instant mashed potato flakes

  • ¾ cup sour cream

  • ½ cup shredded Cheddar cheese, or to taste


  1. Preheat the oven to 350 degrees F (175 degrees C).

  2. Stir water, butter, minced onion, parsley, salt, and thyme together in a saucepan; bring to a boil. Remove from heat and stir in milk. Mix in potato flakes; add sour cream and beat until fluffy. Pour potato mixture into a casserole dish and sprinkle Cheddar cheese over the top.

  3. Bake until cheese is melted and bubbling, 15 to 20 minutes.


You can use as much or as little cheese as you like, but we like to cover the entire thing with a hearty layer of cheese.

Nutrition Facts (per serving)

118 Calories
7g Fat
12g Carbs
2g Protein
Nutrition Facts
Servings Per Recipe 12
Calories 118
% Daily Value *
Total Fat 7g 9%
Saturated Fat 5g 23%
Cholesterol 18mg 6%
Sodium 219mg 10%
Total Carbohydrate 12g 4%
Dietary Fiber 1g 3%
Protein 2g
Vitamin C 10mg 51%
Calcium 48mg 4%
Iron 0mg 2%
Potassium 191mg 4%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.

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