Grandma Deana's Mashed Potato Casserole

Creamy, cheesy, and irresistibly golden, Grandma Deana's Mashed Potato Casserole is the ultimate comfort food recipe that brings a nostalgic twist to your dinner table. Combining fluffy Russet potatoes with rich butter, tangy sour cream, and melty cheddar cheese, this hearty side dish is elevated with a crunchy topping of buttery panko breadcrumbs and Parmesan. Perfect for holidays or weeknight meals, this casserole bakes to crispy, bubbling perfection in just 30 minutes. With hints of garlic and a burst of fresh parsley for garnish, it’s a crowd-pleasing favorite that pairs beautifully with roast meats or vegetables. Whether you're hosting a feast or indulging in homestyle warmth, this mashed potato casserole is bound to become a family classic.

Nutriscore Rating: 61/100

Prep Time:20 mins

Cook Time:30 mins

Total Time:50 mins

Servings: 8

Ingredients

• 4 large Russet potatoes
• 6 tablespoons Butter
• 1 cup Milk
• 1 cup Sour cream
• 2 cups Shredded cheddar cheese
• 1 teaspoon Garlic powder
• 1.5 teaspoons Salt
• 0.5 teaspoon Ground black pepper
• 0.75 cup Panko breadcrumbs
• 0.25 cup Parmesan cheese
• 2 tablespoons Olive oil
• 2 tablespoons Chopped parsley (optional)

Directions

Step 1

Preheat your oven to 375°F (190°C) and grease a 9x13-inch casserole dish with butter or nonstick spray.

Step 2

Peel and chop the russet potatoes into 1-inch cubes. Place them in a large pot and cover with cold water. Add a pinch of salt to the water.

Step 3

Bring the water to a boil over medium-high heat, then reduce the heat to a simmer. Cook the potatoes for 15-20 minutes, or until they are fork-tender.

Step 4

Drain the potatoes and return them to the pot. Add 4 tablespoons of butter, the milk, and sour cream. Mash the potatoes until smooth and creamy.

Step 5

Stir in 1.5 cups of shredded cheddar cheese, garlic powder, salt, and ground black pepper. Mix until well combined.

Step 6

Transfer the mashed potato mixture into the prepared casserole dish and spread it out evenly.

Step 7

In a small bowl, mix the panko breadcrumbs, Parmesan cheese, and olive oil until the breadcrumbs are evenly coated.

Step 8

Sprinkle the breadcrumb mixture evenly over the mashed potatoes, followed by the remaining 0.5 cup of shredded cheddar cheese.

Step 9

Bake in the preheated oven for 25-30 minutes, or until the topping is golden brown and crispy.

Step 10

Remove from the oven and let the casserole cool for 5 minutes. Garnish with chopped parsley, if desired, before serving.

Nutrition Facts

Serving size	(2095.3g)

Amount per serving	% Daily Value*
Calories	3777.6

Total Fat 229.5g	0%
Saturated Fat 129.1g	0%
Polyunsaturated Fat 4.9g
Cholesterol 598.7mg	0%
Sodium 6271.2mg	0%
Total Carbohydrate 332.7g	0%
Dietary Fiber 23.0g	0%
Total Sugars 44.5g
Protein 121.9g	0%

Vitamin D 120.8IU	0%
Calcium 2687.7mg	0%
Iron 16.9mg	0%
Potassium 7231.8mg	0%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 53.2%

Protein: 12.6%

Carbs: 34.3%