Au Gratin Ranch Potatoes

Hash brown casseroles like these Au Gratin Ranch Potatoes are true potluck classics in the South. Made with Southern-style hash brown potatoes, this comforting potato casserole is smothered in a rich, creamy Ranch dressing sauce and loaded with melted cheese. To take it over the top, it’s finished with a crunchy topping of crushed Ranch-flavored potato chips. This easy hash brown casserole recipe is simple to prepare, crowd-pleasing, always the first dish to disappear.

Easy Au Gratin Ranch Potatoes Recipe

There’s nothing quite like a rich, decadent potato casserole to complement hearty main dishes like steak, chicken, pork, or juicy burgers. This au gratin potato casserole delivers maximum flavor with minimal effort, making it an ideal side dish for busy weeknights, family dinners, and holiday meals. Thanks to the use of hash brown potatoes, the prep time for this easy potato casserole is about as simple as it gets.

What truly sets this au gratin potato recipe apart is the bold, crunchy topping. Unlike traditional corn flake–topped potato casseroles, this version goes all in with a flavor-packed topping that adds irresistible texture and takes every bite over the top. Creamy, cheesy, and unapologetically indulgent, this Southern-style potato casserole is the definition of go big or go home comfort food and is guaranteed to be a standout at any potluck or gathering.

Checkout this quick list of key ingredients you’ll need to make Au Gratin Ranch Potatoes: (Scroll down for full printable recipe card.)

• Hashbrowns – This recipe uses frozen Southern style hash browns (i.e. Oneida cubed hash browns).
• Cheese – Shredded white cheddar cheese or classic sharp cheddar cheese for a melty cheesy flavor.
• Sour Cream – Sour cream gives the easy sauce a tangy flavor.
• Soup – One can condensed cream of onion soup for a creamy texture.
• Ranch Seasoning Mix – Dry Ranch salad dressing mix gives these potatoes their signature flavor.
• Spices – Black pepper adds a hint of spice.
• Butter – Melted salted butter or unsalted butter for richness.
• Onion – Green onions for a mild onion flavor.
• Topping – Crushed Ranch flavored potato chips for a crunchy texture.

How to Make the BEST Au Gratin Ranch Potatoes Recipe

• Heat Oven and Prepare Dish – Preheat the oven to 325°F. Spray a 13×9 inch baking dish with cooking spray.
• Mix the Filling – In a large mixing bowl mix together hash browns, onion soup, sour cream, dressing mix, pepper and chopped green onions. Stir everything until the ingredients are evenly distributed.
• Add Melted Butter and Cheese – Add melted butter and shredded white cheddar cheese. Mix well.
• Transfer Potato Mixture to Dish – Pour the mixture into the prepared dish and drizzle with the remaining melted butter.
• Topping – Sprinkle the top of the casserole with cheese and crushed ranch flavored potato chips.
• Oven – Bake per the baking time in the recipe until the top is golden brown, bubbly around the edges and the potatoes are fork tender.
• Serve – Let stand 5 minutes, then scoop and serve.

Kitchen Equipment to Make Ranch Potatoes Recipe

• 13×9-inch casserole dish or pan.
• Large bowl.
• Cheese grater.
• Large rubber spatula or spoon for stirring everything together.
• Measuring cups and spoons.
• Chopping board and knife.

Recipe Variations, Tips and Substitutions

• No Need to Thaw the Hashbrown Potatoes – The hash browns don’t have to be thawed for this recipe. Simply mix together and bake.
• Use Cubed Hashbrowns – When I refer to Southern style hash browns, I mean cubed, not shredded hash browns. You can use Oneida or a similar private label brand that you already enjoy in the same amount.
• Cheese – I used sharp white cheddar cheese for this potato casserole. You can, of course, use classic yellow cheddar, colby jack, colby, Gruyere or any variety of cheese that you enjoy.
• Protein – You could add crispy bacon, ham or chicken to this dish.
• Topping Options – You can top these ranch potatoes simply with cheese and skip the potato chips. You could also use crushed cornflakes tossed with melted butter, panko breadcrumbs or french fried onions.
• Don’t Overbake – When baking, check the topping for the ranch potatoes around 50-60 minutes to make sure they aren’t over browning. If needed, lay a piece of foil on top.
• Shredded Hashbrown Casserole – See how to use shredded hash browns in my Cheesy Hashbrown Casserole.
• Homemade Ranch dressing recipe here.

Storage and Leftovers

• Make-Ahead Tip – You can fully assemble these potatoes one day in advance, cover with plastic wrap and chill in the refrigerator. When doing so, wait to top with the potato chips just before baking.
• Leftovers – You can store leftover Ranch Potatoes chilled in the refrigerator for up to 4 days.
• Reheating – Reheat in single servings in the microwave. You can also reheat leftovers in a preheated 350°F oven just until heated through.
• Freezer – Freeze leftover ranch potatoes for up to 2 months. thaw in the fridge and reheat just before serving.

More Easy Potato Recipes to Make

• My Slow Cooker Sweet Potato Casserole is ideal for holiday gatherings.
• This Ham and Hash Brown Casserole is a brunch favorite.
• Cheesy Mashed Potato Casserole is a family pleasing dish using simple ingredients that the kids will love.
• Green Chile Queso Potatoes is perfection for your next South of the border inspired meal.
• Loaded Scalloped Potatoes is the perfect side dish for the bacon lovers in your life.
•  Twice Baked Smashed Potatoes is a make ahead dish using russet potatoes that works especially well for entertaining.
• Cheddar and Ham Au Gratin Potatoes is a spectacular way to use up leftover ham.
• Roasted Purple Potatoes from Yellow Bliss Road.

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Helpful Kitchen Items: 

• 13×9-inch Dish
• Cheese Grater
• Spatula
• Chopping Board and Knives