Leftover Boiled Potato Casserole Recipe

This Leftover Boiled Potato Casserole recipe transforms your leftover boiled potatoes. Perfect for a quick weeknight dinner or a hearty side dish, this casserole combines simple ingredients to create a rich and savory dish. With layers of creamy potatoes, melted cheese, and a crispy golden top, it’s a great way to reduce waste and enjoy a satisfying meal.

We turn yesterday’s boiled potatoes into today’s comfort food delight.

Inspired by the joy of creating something new from leftovers, this casserole brings together simple, pantry-friendly ingredients for a meal that’s both easy and satisfying.

Whether you’re looking for a quick weeknight dinner or a hearty side dish, this recipe is sure to become a family favorite, showcasing how delicious and versatile leftover potatoes can be.

What are great occasions to enjoy Leftover Boiled Potato Casserole?

This versatile casserole serves multiple purposes. It’s a great option for weeknight family dinners, offering a quick and satisfying meal for busy evenings.

Additionally, it’s perfect for potlucks, gatherings, and parties due to its crowd-pleasing and comforting nature. The dish also shines during holiday meals, complementing festive dishes and providing a cozy, homely side that pairs well with various mains.

Moreover, this casserole is a fitting addition to brunch buffets, where its creamy and savory flavors balance out sweeter breakfast items, making it a hearty option for guests. Lastly, it’s an excellent choice for leftover makeovers, allowing you to transform extra potatoes from big feasts into a new and exciting dish, preventing waste and adding variety to your meals.

Ingredients needed for making Leftover Boiled Potato Casserole

Tender, boiled potatoes serve as the hearty base for our casserole, providing a soft, creamy texture that absorbs flavors beautifully. Their simplicity makes them a perfect canvas for the rich and savory components of the dish.

Fried onions add a delightful crunch and a depth of flavor, with half mixed into the casserole for an even distribution of taste, and the other half sprinkled on top for a crispy, golden finish. Their slightly sweet and savory profile enhances the overall flavor of the dish.

Dairy-free sour cream brings a luscious texture and rich flavor to the casserole, making it indulgent while keeping it suitable for those who avoid dairy. The dairy-free sour cream ensures that the dish remains smooth and cohesive, binding the ingredients together.

Minced garlic infuses the casserole with a robust, aromatic quality, elevating the dish with its unmistakable, savory taste. Garlic’s natural pungency complements the creaminess of the potatoes and the tang of the sour cream, adding layers of flavor.

Vegan cheddar cheese provides a melty, cheesy goodness that’s essential for a comforting casserole. With part of it mixed into the casserole for a creamy interior and the rest sprinkled on top for a gooey, golden crust, it ensures every bite is deliciously cheesy.

How to make Leftover Boiled Potato Casserole

Start with preheating your oven to 380F. Prepare a lightly greased casserole dish.

In a large bowl, mash the leftover potatoes with a potato masher. 

Add the sour cream, 2/3 of the French-fried onions, and vegan cheddar. Season with minced or pressed garlic, salt and pepper. Mix well.

Transfer the potato mixture to the casserole dish and top with the remaining fried onions and cheddar cheese. 

Bake the Leftover Boiled Potato Casserole in the oven for 15 minutes.

 

Serving Suggestions

1. Pair the Leftover Boiled Potato Casserole with a crisp, green salad dressed with a light vinaigrette to balance the richness of the dish. A mix of arugula, spinach, cherry tomatoes, and cucumber can add freshness and texture to your meal.
2. Serve the casserole with a side of roasted vegetables such as carrots, Brussels sprouts, or broccoli. The caramelized flavors of the roasted veggies complement the creamy casserole perfectly.
3. This casserole makes a wonderful side dish for grilled proteins like tofu, tempeh, or plant-based sausages. The savory and hearty combination is both satisfying and well-rounded.
4. Offer some warm, crusty bread on the side to soak up any creamy sauce from the casserole. A rustic baguette or sourdough loaf works well, adding a crunchy contrast to the dish.
5. Start your meal with a light, broth-based soup such as vegetable or miso soup. This helps to prepare the palate for the richness of the casserole and provides a comforting, multi-course dining experience.
6. Garnish the casserole with freshly chopped herbs like parsley, chives, or dill before serving. The herbs add a burst of color and a fresh, aromatic element that enhances the dish’s appeal.

Storage and Reheating Tips

Storage

1. Allow the Leftover Boiled Potato Casserole to cool completely before transferring it to an airtight container. Store it in the refrigerator for up to 3-4 days to maintain freshness and flavor.
2. For longer storage, you can freeze the casserole. Wrap it tightly in plastic wrap, followed by aluminum foil, or place it in a freezer-safe container. Label with the date and freeze for up to 2-3 months.

Reheating

1. Oven Reheating: Preheat your oven to 350°F (175°C). If refrigerated, place the casserole in an oven-safe dish, cover with aluminum foil to prevent drying out, and bake for 20-30 minutes until heated through. If frozen, allow the casserole to thaw in the refrigerator overnight before reheating in the oven.
2. Microwave Reheating: For a quicker option, transfer a portion of the casserole to a microwave-safe dish. Cover loosely with a microwave-safe lid or microwave-safe plastic wrap, leaving a small vent. Microwave on medium power for 2-4 minutes, stirring halfway through, until thoroughly heated.
3. Stovetop Reheating: Heat a non-stick skillet over medium heat and add the portion of the casserole. Cover the skillet with a lid and cook, stirring occasionally, until heated through. Add a splash of water or broth if the casserole starts to dry out.

Other Potato Recipes to try

• Hashbrown Potatoes
• Vegan Potato Casserole
• Loaded Mashed Potatoes
• Bombay Potatoes
• Greek Lemon Potatoes

I love hearing about your personal twists on this Leftover Boiled Potato Casserole! Have you added a special ingredient or substituted with what you had on hand? Share your variations in the comments below and inspire fellow readers with your creativity.

Did you try this recipe? Let me know how it turned out! Post a comment with your feedback and feel free to upload photos of your casserole to Instagram and Facebook. I enjoy seeing our recipes come to life in your kitchens and it helps others get a sense of how the dish might look.