These party potatoes aren't your ordinary mashed potatoes! You can make the mashed potato casserole and refrigerate overnight to bake the next day.
Prep Time 25 minutes mins
Cook Time 45 minutes mins
Total Time 1 hour hr 10 minutes mins
To achieve the silkiest texture, ensure potatoes are cooked until very tender; however, avoid over-mashing, which can activate starch and lead to a gummy consistency. The combination of cream cheese and sour cream is crucial for richness and tang; consider using full-fat versions for maximum flavor. For enhanced depth, sauté minced onions or shallots and fold them in, complementing the onion salt. To elevate presentation and add textural contrast, sprinkle the top with grated Parmesan and panko breadcrumbs mixed with a touch of melted butter before baking for a golden, crispy crust. When making ahead, allow the casserole to come to room temperature slightly before baking to ensure even heating.