Everything you love about a loaded baked potato, in a make-ahead casserole the whole table fights over. Ultra-creamy mashed potatoes folded with sour cream and cream cheese, topped with sharp cheddar, crispy bacon and chives, then baked until bubbly and golden. It's the perfect holiday or Sunday side — and you can assemble it a day ahead, which makes it a lifesaver when the oven is full.
Fun fact: potatoes were the first vegetable grown in space — NASA and the University of Wisconsin sprouted them aboard the shuttle Columbia in 1995, as research into feeding astronauts on long missions. Down on Earth, the average American eats about 110 pounds of potatoes a year.
Why this recipe works
- CREAM CHEESE + sour cream. Together they make the mash luxuriously rich and keep it creamy even after baking.
- WARM the dairy. Cold milk and butter make gluey potatoes; warm dairy keeps them fluffy.
- MAKE AHEAD friendly. Assemble, refrigerate, and bake when needed — the texture holds up beautifully.
Nutrition information
- Calories: 360 kcal per serving
- Protein: 12 g
- Carbohydrates: 34 g
- Fat: 20 g
- Saturated Fat: 11 g
- Fiber: 3 g
Pro tips for the best loaded mashed potato casserole
- Make ahead. Assemble, cover and refrigerate up to 2 days; add 10-15 minutes to the bake from cold.
- Russet vs Yukon. Russets give the fluffiest mash; Yukon gold is creamier and more buttery. Both work.
- Don't over-mash. Overworking releases starch and turns potatoes gummy. Mash just until smooth.
- Freeze it. Freezes up to 2 months; thaw overnight and bake covered.
Frequently asked questions
Can I make this ahead of time?
Yes — that's its superpower. Assemble up to 2 days ahead, refrigerate, and bake before serving, adding time since it starts cold.
What potatoes are best?
Russet for fluffy, Yukon gold for creamy and buttery. A mix of both is excellent.
Can I freeze it?
Yes — freeze before or after baking for up to 2 months. Thaw overnight in the fridge, then bake until hot.
How do I keep mashed potatoes from getting gluey?
Use warm dairy, don't overmix, and avoid a food processor (it makes them gummy). A masher or ricer is best.
Can I add other toppings?
Absolutely — caramelized onions, jalapeños, ranch seasoning or extra cheese all work.
