Mashed Potato Souffle
A fluffy, savory potato souffle with caramelized onion topping, marrying creamy potatoes, herbs, and golden butter—perfect for brunch or a comforting side for any gathering.
Ingredients
Instructions
- In a large bowl combine mashed potatoes, heavy cream, grated onion, and 1 teaspoon salt.
- Beat in softened butter, egg yolks, and a pinch of salt and white pepper.
- In another bowl beat egg whites with a pinch of salt and cream of tartar until stiff peaks form.
- Fold the beaten whites into the potato mixture.
- Place the mixture into a buttered 1 to 1½‑quart casserole.
- Top with sliced sweet onions, brush with melted butter, and bake for 45 minutes.
- Serve immediately.
- NOTE: Do not double the recipe.
Tips & Substitutions
For a smoother texture, ensure your mashed potatoes are well-blended before mixing in the other ingredients. If you're short on time, you can use pre-made mashed potatoes. For a twist, consider adding cheese or herbs to the mixture. Using a mix of sweet and regular onions can enhance the flavor profile. Make sure your egg whites are at room temperature for better volume.
Serving Suggestions
This Mashed Potato Soufflé is best served hot and can be a delightful side dish to accompany roasted meats or a vegetarian main dish. It pairs beautifully with Baked Tomato Casserole or a fresh salad. For added flair, garnish with fresh herbs or a drizzle of melted butter before serving.
Storage & Reheating
Store any leftovers in an airtight container in the refrigerator for up to 3 days. To reheat, place the soufflé in a preheated oven at 350°F (175°C) for about 20 minutes or until heated through. You can also microwave individual portions for a quick meal, but be aware this may alter the texture slightly.
Nutrition & Diet Analysis (per serving)
Each serving of Mashed Potato Souffle contains roughly 1587 calories, with 28g protein, 165g carbohydrates, and 90g fat. It is an excellent source of potassium (106% of the Daily Value), vitamin C (65% of the Daily Value), and protein (56% of the Daily Value), and a good source of vitamin D. It also contributes 14g of dietary fiber toward your daily target.
Estimated from ingredients & per-serving nutrition — verify against package labels for allergies or strict diets.
* % Daily Values based on a 2,000 calorie diet (FDA 2020).
Frequently Asked Questions
Can I prepare the soufflé in advance?
Yes, you can prepare the mixture ahead of time and store it in the refrigerator, but it’s best to bake it right before serving for optimal texture. Assemble everything except the egg whites, then fold them in just before baking to retain the soufflé's lift.
What can I substitute for heavy cream?
You can substitute heavy cream with half-and-half or evaporated milk for a lighter option. If you're looking for a dairy-free alternative, coconut cream works well, but keep in mind it will add a subtle coconut flavor to the dish.
Why did my soufflé not rise?
A soufflé may not rise if the egg whites are not whipped to stiff peaks or if they are overmixed when folding into the potato mixture. Additionally, ensuring your baking dish is properly buttered and preheated oven temperature is crucial for a good rise.
Nutrition is estimated from USDA FoodData Central ingredient data and may vary with brand, portion and preparation — see our methodology. This information is for general educational purposes only and is not medical or dietary advice (disclaimer).