25 Steps to the Best Easy Hashbrown Casserole

Remove 900 g (32 oz) frozen shredded hash browns from the freezer and thaw overnight in the fridge, or at room temperature for about 1 hour. Pat them thoroughly dry with a clean tea towel or paper towels — excess moisture is the number one reason hashbrown casseroles turn out watery, so don't skip this step.

Preheat your oven to 175°C (350°F) with a rack in the middle position. Grease a 23x33 cm (9x13 inch) baking dish generously with butter or non-stick spray so the edges release cleanly after baking.

Melt 115 g (1/2 cup) unsalted butter in a small saucepan or microwave-safe bowl until fully liquid, about 1 minute on high. Set aside 85 g for the topping and keep 30 g in the pan for sautéing.

Warm the 30 g of butter in a medium skillet over medium heat until it foams. Add 150 g (1 medium) finely diced onion and cook for 4-5 minutes, stirring occasionally, until softened and translucent but not browned.

Stir in 2 cloves minced garlic and cook for 30-45 seconds, just until fragrant. Remove the skillet from the heat immediately so the garlic doesn't scorch and turn bitter.

Transfer the sautéed onion and garlic to a large mixing bowl and let cool for 5 minutes. Adding hot onions straight to the sour cream can cause it to separate, so this brief cooling step keeps the sauce smooth.

Add 298 g (10.5 oz) condensed cream of chicken soup and 240 ml (1 cup) sour cream to the cooled onions. Whisk until completely smooth with no streaks of soup remaining.

Stir in 1 tsp fine sea salt, 1/2 tsp freshly ground black pepper and 1/2 tsp smoked paprika. Taste and adjust — the mixture should taste well-seasoned on its own since the potatoes themselves are mild.

Add 250 g of the 340 g (12 oz) shredded sharp cheddar to the bowl, reserving the rest for topping. Fold gently with a spatula until the cheese is evenly distributed through the creamy base.

Add the thawed, dried hash browns to the bowl in two batches, folding gently after each addition. Mix just until every shred of potato is coated in the creamy cheese sauce — overmixing can break up the potatoes.

The mixture should look thick and scoopable, never soupy. If it looks loose, drain off any pooled liquid from the bottom of the bowl before continuing, and remember to pat the potatoes drier next time.

Scrape the mixture into the prepared 23x33 cm (9x13 inch) dish using a rubber spatula to get every last bit out of the bowl.

Use the back of the spatula to press the mixture into an even layer, right into the corners of the dish. An even layer bakes at the same rate throughout, so you avoid dry edges and an undercooked centre.

Sprinkle the reserved 90 g cheddar evenly over the surface. This second layer melts into a golden, bubbling crust that helps seal in moisture while the casserole bakes.

In a small bowl, lightly crush 120 g (2 cups) cornflakes with your hands so they keep some texture rather than turning to dust. Toss the crushed flakes with the reserved 85 g melted butter until every flake is coated and glossy.

Sprinkle the buttered cornflakes evenly over the cheese layer, covering the surface in a thin, even blanket. This is what gives the casserole its signature crunchy contrast against the creamy potatoes underneath.

Cover the baking dish tightly with aluminium foil, tenting it slightly so it doesn't touch the topping. Covering for the first stretch of baking lets the potatoes cook through gently before the topping browns.

Place the dish in the preheated 175°C (350°F) oven and bake covered for 25 minutes. This allows the hash browns to soften fully and the flavours to meld before the topping crisps up.

Carefully remove the foil, watching for escaping steam, and set it aside. The casserole should already be hot and bubbling gently around the edges at this point.

Return the dish to the oven, uncovered, and bake for a further 20-25 minutes. Watch for the topping to turn deep golden brown and the sauce to bubble visibly at the edges.

Insert a knife or skewer into the centre — it should meet no resistance and come out hot to the touch. If the centre still feels firm or cool, bake in 5-minute increments until it does.

Remove the dish from the oven and let it rest, uncovered, on a wire rack for 8-10 minutes. Resting allows the sauce to thicken slightly so each slice holds together when served instead of sliding apart.

Scatter 2 tbsp finely chopped fresh chives over the top just before serving. The fresh, oniony bite cuts through the richness and adds a pop of colour against the golden crust.

Cut the casserole into 8 even squares using a sharp knife, wiping the blade clean between cuts for neat edges. Lift each portion out with a spatula, letting any extra sauce fall back into the dish.

Serve immediately while the topping is still crisp and the centre is molten and cheesy. This casserole pairs perfectly with baked ham, scrambled eggs or a simple green salad for a complete brunch spread.