This comforting mashed potato soup is the ultimate solution for transforming leftover mashed potatoes into a luxurious, velvety meal. It achieves a rich consistency and deep flavor profile in under thirty minutes, making it a perfect quick-fix dinner or a satisfying lunch during colder weather. By repurposing potatoes that have already been cooked and mashed, you bypass much of the traditional prep work while maintaining a professional-grade texture.
List of ingredients
- 2 tablespoons butter
- ½ small onion, diced
- 1 tablespoon all-purpose flour
- 2 cups vegetable or chicken stock
- 1 teaspoon Italian seasoning
- 3 cups leftover mashed potatoes
- 1/3 cup Parmesan cheese, freshly grated
- salt and pepper (to taste)
- cheddar cheese, shredded (optional, for topping)
step-by-step instructions
- Step: In a large stockpot melt butter over medium-high heat, until it starts to bubble, about 1 minute.
- Step: Add onion and sauté until soft and tender and starting to brown, about 3-4 minutes.
- Step: Add flour and mix well until evenly combined with the onion mixture and continue to cook for another minute.
- Step: Pour in stock and Italian seasoning and mix well. Bring the mixture to a simmer, about 3-4 minutes.
- Step: Add in mashed potatoes and Parmesan cheese. Mixing until all the potatoes have broken up and the cheese has melted. Season with salt and pepper to taste.
- Step: Let the soup simmer over medium heat for 8-10 minutes until thickened to a desired consistency, stirring occasionally.
- Step: Ladle into bowls and top with shredded cheddar cheese.
Refining your technique
Achieving the perfect soup consistency
The texture of your soup depends heavily on how thick or thin you prefer your bowls. If the soup appears too thick after simmering, add more stock or water one tablespoon at a time until you reach a silky consistency that pours easily. Conversely, if you prefer a heartier, thicker chowder-style soup, allow it to simmer for a few extra minutes to evaporate more moisture.
Ensuring smooth incorporation
When adding your leftover mashed potatoes, ensure they are broken up thoroughly with your spoon or a whisk. If your leftover potatoes were very firm or cold, you may find it helpful to whisk the stock and potatoes together vigorously to ensure there are no lumps remaining. Using a wire whisk during this stage can yield a restaurant-quality, ultra-smooth texture that hides the fact that the ingredients were previously chilled.
Managing the salt content
Because mashed potatoes are typically seasoned before they are placed in the refrigerator, it is vital that you taste the soup before adding additional salt. Start by adding a small pinch of pepper first, then taste the base. Only add salt if the soup specifically requires it, as the Parmesan cheese and stock also contribute significant sodium to the overall profile.
Customizing your bowl
Exploring flavor profiles with cheese
While Parmesan and cheddar are the classic choices for this recipe, you can easily experiment with other varieties based on what is in your kitchen. Gruyère offers a nutty, sophisticated melt, while Pepper Jack provides a subtle heat that cuts through the starch of the potatoes. For a tangier profile, consider stirring in a small dollop of sour cream or cream cheese during the final minutes of simmering.
Adding vegetable variety
To increase the nutritional density of the meal, consider wilting a handful of fresh spinach or finely chopped kale into the pot during the final three minutes of cooking. Another excellent option is to sauté diced carrots or celery alongside your onions at the beginning. These additions provide a delightful crunch and vibrant color contrast against the creamy base.
Experimenting with fresh herbs
While Italian seasoning provides a reliable baseline, fresh herbs can elevate the dish significantly when added right before serving. Fresh chives add a mild onion-like brightness that pairs exceptionally well with the sharpness of cheddar cheese. Finely chopped parsley or dill can also offer a refreshing finish that lightens the overall intensity of the potato base.
Storage and preparation
Maintaining quality in the refrigerator
This soup stores remarkably well in an airtight container for up to four days in the refrigerator. Over time, the potatoes may continue to absorb some of the liquid, so do not be surprised if the soup appears thicker the next day. Simply add a splash of stock or water during the reheating process to restore the original, creamy texture.
Effective reheating methods
The most reliable way to reheat this dish is on the stovetop over medium-low heat. Keep the heat controlled to prevent the cheese from separating or the potatoes from sticking to the bottom of the pot. Stir frequently until the mixture is uniform and warmed through; this usually takes about 5 to 10 minutes depending on the quantity of soup being heated.
Addressing common kitchen questions
Is it possible to make this soup using fresh potatoes instead of leftovers?
Yes, you can certainly use fresh potatoes if you do not have leftovers on hand. Simply peel, chop, and boil approximately one pound of potatoes until they are fork-tender, drain them well, and mash them thoroughly before proceeding with the recipe instructions as written. This will yield a similarly delicious result, though it will add about 15 to 20 minutes to your total preparation time.
What is the best way to handle a soup that has become too thin?
If you find your soup has too much liquid, you can simmer it uncovered for a longer period to allow evaporation to thicken the base naturally. Alternatively, you can mix a small amount of cornstarch with cold water to create a slurry and stir it into the simmering soup. This will thicken the mixture almost instantly without changing the flavor profile of the potatoes or seasonings.
Can this soup be served for larger gatherings?
This recipe is highly scalable, making it an excellent candidate for larger dinners or holiday gatherings. Simply multiply the ingredients proportionally based on the number of guests you intend to feed. When cooking in a larger volume, ensure you use a pot large enough to accommodate the ingredients comfortably, as a deeper pot will allow you to maintain an even simmer without the risk of overflowing during the thickening phase.
How can I achieve a chunkier texture?
If you prefer a more rustic, textured soup, avoid mashing your leftover potatoes completely before adding them to the pot. Leave some of the potatoes in larger pieces and fold them in gently at the end of the cooking process. This preserves the individual potato pieces, providing a more tactile experience that feels closer to a loaded baked potato style bowl.
Print
Creamy Mashed Potato Soup
- Total Time: 25 minutes
- Yield: 4 servings 1x
- Diet: Vegetarian
Description
Mashed potato soup is one of the best ways to use up leftover mashed potatoes. It’s creamy, cheesy, delicious, and ready in under 30 minutes.
Ingredients
- 2 tablespoons butter
- ½ small onion, diced
- 1 tablespoon all-purpose flour
- 2 cups vegetable or chicken stock
- 1 teaspoon Italian seasoning
- 3 cups leftover mashed potatoes
- 1/3 cup Parmesan cheese, freshly grated
- salt and pepper (to taste)
- cheddar cheese, shredded (optional, for topping)
Instructions
- Step: In a large stockpot melt butter over medium-high heat, until it starts to bubble, about 1 minute.
- Step: Add onion and sauté until soft and tender and starting to brown, about 3-4 minutes.
- Step: Add flour and mix well until evenly combined with the onion mixture and continue to cook for another minute.
- Step: Pour in stock and Italian seasoning and mix well. Bring the mixture to a simmer, about 3-4 minutes.
- Step: Add in mashed potatoes and Parmesan cheese. Mixing until all the potatoes have broken up and the cheese has melted. Season with salt and pepper to taste.
- Step: Let the soup simmer over medium heat for 8-10 minutes until thickened to a desired consistency, stirring occasionally.
- Step: Ladle into bowls and top with shredded cheddar cheese.
Notes
Keep leftover mashed potato soup in an airtight container in the refrigerator for up to three to four days. Reheat on the stove over medium-low heat until warmed through, about 5-10 minutes.
- Prep Time: 5 minutes
- Cook Time: 20 minutes
- Category: Soup
- Method: Stovetop
- Cuisine: American
Nutrition
- Serving Size: 1.5 cups
- Calories: 280 kcal
- Sugar: 3 g
- Sodium: 650 mg
- Fat: 12 g
- Saturated Fat: 7 g
- Unsaturated Fat: 4 g
- Trans Fat: 0 g
- Carbohydrates: 32 g
- Fiber: 3 g
- Protein: 9 g
- Cholesterol: 30 mg