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Sour Cream & Onion Smashed Potato Casserole 🧀 A Comfort Food Must-Try!
Welcome to Comfort Food Bliss
Are you craving a dish that wraps you in a warm, savory hug? In a world where weeknight dinners can often feel rushed and uninspired, is there anything more satisfying than a perfectly executed potato casserole? If you’re nodding along, then get ready to meet your new best friend: the Sour Cream & Onion Smashed Potato Casserole! This isn’t just another side dish; it’s an experience. It’s the kind of recipe that transforms simple potatoes into a creamy, dreamy, utterly irresistible masterpiece. Perfect for potlucks, holiday gatherings, or simply elevating a Tuesday night dinner, this casserole boasts a delightful balance of tangy sour cream, pungent onion, and tender, flavorful potatoes. Let’s embark on a culinary adventure that promises pure comfort and undeniable deliciousness!
The Star Ingredients
The magic of this Sour Cream & Onion Smashed Potato Casserole lies in its ability to elevate humble ingredients into something truly spectacular. We’re talking about that perfect combination of creamy, savory, and slightly tangy notes that makes you want to go back for a second (or third!) helping.
- 1.5 kg Yukon Gold Potatoes: These are your champions! Their waxy texture holds up beautifully to boiling and smashing, ensuring a creamy yet distinct bite. Substitutions: Russet potatoes can work, but they tend to break down more, leading to a softer casserole. Red or yellow potatoes are also good alternatives.
- 240 ml (1 cup) Full-Fat Sour Cream: This is where the signature tang and luscious creaminess come from. Substitutions: Greek yogurt (full-fat for richness) or a mix of cream cheese and milk can be used, but the flavor will be slightly different.
- 120 ml (1/2 cup) Milk (Whole or 2%): To achieve the perfect consistency. Substitutions: Half-and-half or even heavy cream for extra decadence. Non-dairy milk can be used, but ensure it’s unsweetened.
- 100g (about 1 cup) Shredded Sharp Cheddar Cheese: For that irresistible cheesy pull and savory depth. Substitutions: Gruyère, Monterey Jack, or a blend of your favorite melting cheeses.
- 1 Small Onion, finely chopped: The aromatic backbone, providing a subtle sweetness and bite. Substitutions: Shallots or even leeks (white and light green parts only) for a milder flavor.
- 3 cloves Garlic, minced: Because garlic makes everything better!
- 2 tablespoons Unsalted Butter: For richness and flavor. Substitutions: Olive oil or ghee.
- 1/4 cup Fresh Chives, chopped (for garnish): For a fresh, oniony pop of color. Substitutions: Green onions or fresh parsley.
- Salt and Freshly Ground Black Pepper: To taste, the essential flavor enhancers.
- Optional: 2 tablespoons Sour Cream for topping
Perfecting the Timing
Understanding the time commitment ensures you’re perfectly prepared for this culinary delight. While the average potato casserole might take around 1 hour, our Sour Cream & Onion version requires a bit more finesse to achieve that perfect mash and bake.

Step-by-Step Culinary Journey
Let’s get started on creating this incredibly satisfying dish. Follow these steps closely for a flawless result!
Step 1: Prepare the Potatoes
Begin by preheating your oven to 375°F (190°C). Wash your Yukon Gold potatoes thoroughly. You don’t need to peel them; the skins add a lovely texture and nutrients. Cut the potatoes into roughly 1.5-inch chunks. This ensures they cook evenly.
Step 2: Boil and Smash
Place the potato chunks in a large pot and cover them with cold water by about an inch. Add a generous pinch of salt to the water. Bring to a boil over high heat, then reduce heat to medium and simmer until the potatoes are fork-tender, usually about 15-20 minutes. Drain the potatoes thoroughly. Return the drained potatoes to the hot, empty pot for about 1-2 minutes over low heat to help evaporate any residual moisture – this is key to avoiding a watery casserole! Now, using a potato masher or a sturdy fork, gently smash the potatoes. Don’t aim for a smooth puree; you want some texture and distinct pieces. Some potatoes should remain chunky, while others will break apart.
Step 3: Flavor Infusion
While the potatoes are steaming, melt the butter in a small skillet over medium heat. Add the finely chopped onion and sauté until softened and translucent, about 5-7 minutes. Add the minced garlic and cook for another minute until fragrant. Be careful not to burn the garlic.
Step 4: Assemble the Casserole
In a large bowl, combine the smashed potatoes, sour cream, milk, sautéed onion and garlic mixture, and shredded cheddar cheese. Season generously with salt and freshly ground black pepper. Gently fold everything together until just combined. Be careful not to overmix, as this can make the potatoes gummy. Stir in half of the chopped chives, if using.
Step 5: Bake to Perfection
Spoon the potato mixture into a lightly greased 9×13 inch baking dish. Spread it out evenly. For an extra touch of decadence and a beautiful golden-brown top, you can dollop small spoonfuls of the optional extra sour cream over the surface and sprinkle with a little more cheese. Bake in the preheated oven for 45-50 minutes, or until the casserole is heated through, bubbly, and the top is golden and slightly crispy in places. Let it rest for about 10 minutes before serving to allow it to set.
Nutritional Highlights
While specific nutritional values can vary based on exact ingredient brands and quantities, a typical serving of this Sour Cream & Onion Smashed Potato Casserole offers:
- Calories: Approx. 300-400 per serving
- Macronutrients: A good source of carbohydrates for energy, moderate protein, and fat.
- Vitamins & Minerals: Potassium from potatoes, calcium from dairy, and B vitamins.
Disclaimer: This is an estimate. For precise nutritional information, please calculate using your specific ingredients.
Smarter Swaps, Same Great Taste
Want to make this a lighter yet still satisfying dish? Here are a few ideas:
- Reduced-Fat Dairy: Swap full-fat sour cream and whole milk for their lighter counterparts. While this might slightly alter richness, the flavor profile remains largely intact.
- Greek Yogurt: As mentioned, plain, non-fat Greek yogurt is an excellent substitute for sour cream, offering tanginess with less fat and more protein.
- Add Veggies: Stir in steamed broccoli florets, roasted bell peppers, or sautéed mushrooms for added fiber, nutrients, and texture without sacrificing flavor.
- Herbs Galore: Increase the amount of fresh chives, parsley, or dill. Herbs add intense flavor without adding calories.
Serving Suggestions
This casserole is incredibly versatile. It pairs beautifully with:
- Roasted meats like chicken, pork, or beef.
- Grilled salmon or other fish dishes.
- Hearty stews or chili.
- As a standalone vegetarian main with a fresh green salad.
- At holiday buffets alongside other classic sides.
Common Mistakes to Avoid
To ensure your casserole is perfect every time, steer clear of these common pitfalls:
- Over-boiling Potatoes: This leads to mushy, waterlogged potatoes that can make the casserole heavy and unappealing.
- Not Draining Potatoes Well: Excess water will result in a watery casserole. Ensure potatoes are very well-drained and even lightly dried.
- Over-mashing: Creaminess is great, but overdoing the mashing can turn your potatoes into a paste. Aim for a slightly textured mash.
- Under-seasoning: Potatoes are a blank canvas. Don’t be shy with salt and pepper! Taste and adjust seasoning before baking.
- Baking at Too High a Temperature: This can cause the outside to burn before the inside is heated through and bubbly.
Storing Your Delicious Casserole
Leftovers can be stored:
- In the refrigerator: Cover the baking dish tightly with plastic wrap or foil, or transfer to an airtight container. It will keep for 3-4 days.
- To reheat: You can reheat individual portions in the microwave until warmed through. For larger portions, reheat in the oven at 350°F (175°C) until heated through, about 20-30 minutes, to help restore some of the crispiness.
Your New Go-To Comfort Dish
The Sour Cream & Onion Smashed Potato Casserole is more than just a recipe; it’s an invitation to cozy up and savor the simple pleasures. With its rich, creamy texture and bold flavors, it’s guaranteed to become a beloved staple in your recipe repertoire. Whether you’re a seasoned cook or just starting out, this dish is forgiving, immensely satisfying, and always a crowd-pleaser. So, gather your ingredients, invite your loved ones, and prepare to be delighted by this ultimate comfort food creation. What are you waiting for? Get in the kitchen and make some potato magic happen!
Frequently Asked Questions
***Can I make this casserole ahead of time?***
Yes, you can assemble the casserole up to a day in advance. Cover and refrigerate it. You may need to add an extra 10-15 minutes to the baking time if baking directly from the refrigerator.
***What kind of potatoes are best?***
Yukon Gold potatoes are highly recommended for their creamy texture that holds up well to smashing. Russets can be used but may result in a softer, more uniform mash.
***Can I add other vegetables?***
Absolutely! Sautéed mushrooms, steamed broccoli florets, or roasted bell peppers are excellent additions that can be folded in with the potato mixture.
***Why are my potatoes watery?***
Ensure you drain the boiled potatoes very well. Returning them to the hot, empty pot for a minute to steam off excess moisture is a crucial step to prevent a watery casserole.

Sour Cream and Onion Smashed Potato Casserole Recipe
Description
Welcome to a mouthwatering adventure with ourSour Cream and Onion Smashed Potato Casserole! This dish is perfect for gatherings, cozy dinners, or just a comforting weekday meal. Whether you’re a fan of traditional potato casseroles or looking for a twist on a classic side, this recipe is bound to become a favorite. Let’s dive into the world of rich, creamy potatoes with a burst of onion flavor!
Ingredients
- Optional substitutions:
Instructions
- Preheat your oven to375 degrees Fahrenheit(190 degrees Celsius) to ensure an even bake throughout the casserole.
- Place the peeled and diced potatoes into a large pot and cover them with cold water. Bring to a boil over high heat, then reduce the heat and simmer for about15-20 minutesor until the potatoes are tender when pierced with a fork.
- Pro Tip:For extra creamy potatoes, use a potato ricer instead of a masher.
- Drain the potatoes and return them to the pot. Add thesour cream,milk,melted butter,garlic powder,paprika,salt, andpepper. Use a potato masher or a fork to smash the potatoes until well combined, leaving some texture for that homemade feel.
- Fold in theshredded cheddar cheeseandsliced green onions, mixing until they are evenly distributed throughout the mixture.
- Transfer the potato mixture to agreased 9×13 inch casserole dishand smooth out the top using a spatula. Bake in the preheated oven for20-25 minutesuntil the top is golden and the edges are bubbly.
Notes
For a crispy top:Sprinkle additional shredded cheddar cheese over the top before baking.
Make it ahead:You can prepare the casserole up to 2 days in advance and refrigerate it. When ready to serve, bake as directed.
Customize it:Add crispy chekin bits, caramelized onions, or sautéed mushrooms to make it a unique casserole creation.
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