Mashed Potato Casserole
Mashed potato casserole turns simple Russet potatoes into a creamy, cheesy side dish with fluffy centers, crisp cheddar edges, and real comfort in every scoop.
Why You’ll Love This Recipe
- It tastes rich and cozy, with tangy sour cream, mellow garlic, and sharp cheddar in every bite.
- The texture is creamy in the middle with lightly browned cheese on top.
- It uses simple grocery staples and stretches potatoes into a filling dish for four people.
- You can make it ahead, then bake it when dinner is close.
Fabian’s Budget Tip: Buy Russet potatoes in a larger bag if the price per pound is lower. Use store brand cream cheese, sour cream, and cheddar. If cheddar costs more than usual, use half the amount on top and stir one extra tablespoon of butter into the mash for richness.
Ingredients (Serves 4)
- 2 pounds Russet potatoes (900 g), peeled and cut into 1 inch chunks
- 4 tablespoons butter (56 g), softened
- 4 ounces cream cheese (115 g), softened
- 1/2 cup sour cream (120 g)
- 1/3 cup milk (80 ml), warmed
- 2 garlic cloves, finely minced or grated
- 1 cup shredded cheddar cheese (115 g)
- 2 tablespoons chopped chives (6 g), plus more for serving
- 1 teaspoon salt (6 g), plus more for the potato water
- 1/2 teaspoon black pepper (1 g)
Step-by-Step Instructions
1. Boil the Potatoes
Place the potato chunks in a large pot and cover them with cold water. Add enough salt so the water tastes lightly seasoned. Bring the pot to a boil, then cook for 15 to 18 minutes, until a fork slides through the potatoes with no crunch and the edges look soft and fluffy.
2. Warm the Dairy
While the potatoes cook, set out the butter, cream cheese, sour cream, warm milk, garlic, salt, and pepper. Warm milk blends into hot potatoes more smoothly than cold milk, so the mash stays creamy instead of tight.
3. Mash Until Creamy
Drain the potatoes very well, then return them to the warm pot for 1 minute. Let the steam rise off the surface so the casserole does not turn watery. Add the butter, cream cheese, sour cream, milk, garlic, salt, and pepper. Mash until the mixture looks thick, creamy, and a little fluffy. The garlic should smell warm and mellow, not sharp.
4. Fill the Baking Dish
Lightly butter an 8 by 8 inch baking dish. Spoon in the mashed potatoes and spread them to the corners. Leave a few gentle ridges on top because those spots catch the cheese and brown nicely in the oven.
5. Top and Bake
Sprinkle the cheddar cheese evenly over the potatoes. Bake at 375°F (190°C) for 20 to 25 minutes, until the casserole is hot in the center, the edges bubble softly, and the cheddar has light brown spots. Your kitchen should smell buttery, garlicky, and toasted.
6. Rest and Garnish
Let the casserole rest for 5 minutes before serving. This short wait helps each scoop hold together. Scatter chopped chives over the top right before serving for a fresh onion flavor and a bright finish.
Expert Troubleshooting & FAQs
Why did my mashed potato casserole turn gluey?
The potatoes were likely mixed too much. Mash by hand and stop as soon as the dairy blends in. Russet potatoes can turn sticky if you beat them hard or use a food processor.
Can I make this ahead?
Yes. Assemble the casserole, cover it, and chill it for up to 24 hours. Let it sit at room temperature for 20 minutes before baking, then add a few extra minutes in the oven until the center is hot.
What can I use instead of cream cheese?
Use extra sour cream plus 1 tablespoon of butter. The casserole will taste a little less tangy, but it will still bake up creamy and rich.
Can I use Yukon Gold potatoes?
Yes. Yukon Gold potatoes make a denser, buttery mash. Russets give the fluffiest result, but Yukon Golds work well if that is what you have.
How do I reheat leftovers?
Cover the casserole with foil and warm it at 350°F (175°C) until hot. For a single serving, microwave it in short bursts and stir once so the heat spreads evenly.
Estimated Nutritional Facts
These numbers are rough estimates per serving and will vary based on the exact brands you use.
- Calories: about 410
- Protein: about 12 g
- Carbs: about 38 g
- Fats: about 24 g
Mashed Potato Casserole
Ingredients
- 2 pounds Russet potatoes (900 g), peeled and cut into 1 inch chunks
- 4 tablespoons butter (56 g), softened
- 4 ounces cream cheese (115 g), softened
- 1/2 cup sour cream (120 g)
- 1/3 cup milk (80 ml), warmed
- 2 garlic cloves, finely minced or grated
- 1 cup shredded cheddar cheese (115 g)
- 2 tablespoons chopped chives (6 g), plus more for serving
- 1 teaspoon salt (6 g), plus more for the potato water
- 1/2 teaspoon black pepper (1 g)
Instructions
- 1. Boil the Potatoes. Place the potato chunks in a large pot and cover them with cold water. Add enough salt so the water tastes lightly seasoned. Bring the pot to a boil, then cook for 15 to 18 minutes, until a fork slides through the potatoes with no crunch and the edges look soft and fluffy.
- 2. Warm the Dairy. While the potatoes cook, set out the butter, cream cheese, sour cream, warm milk, garlic, salt, and pepper. Warm milk blends into hot potatoes more smoothly than cold milk, so the mash stays creamy instead of tight.
- 3. Mash Until Creamy. Drain the potatoes very well, then return them to the warm pot for 1 minute. Let the steam rise off the surface so the casserole does not turn watery. Add the butter, cream cheese, sour cream, milk, garlic, salt, and pepper. Mash until the mixture looks thick, creamy, and a little fluffy. The garlic should smell warm and mellow, not sharp.
- 4. Fill the Baking Dish. Lightly butter an 8 by 8 inch baking dish. Spoon in the mashed potatoes and spread them to the corners. Leave a few gentle ridges on top because those spots catch the cheese and brown nicely in the oven.
- 5. Top and Bake. Sprinkle the cheddar cheese evenly over the potatoes. Bake at 375°F (190°C) for 20 to 25 minutes, until the casserole is hot in the center, the edges bubble softly, and the cheddar has light brown spots. Your kitchen should smell buttery, garlicky, and toasted.
- 6. Rest and Garnish. Let the casserole rest for 5 minutes before serving. This short wait helps each scoop hold together. Scatter chopped chives over the top right before serving for a fresh onion flavor and a bright finish.
