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Why This Recipe Works
The culinary brilliance of this recipe lies in the intentional layering of flavors through a classic stovetop roux.
Sautéing fresh diced onions and minced garlic before adding your flour builds a deeply aromatic foundation that permeates every single bite.
Instead of an artificially thick, gummy texture, the precise combination of chicken stock and whole milk creates a perfectly smooth, luxurious gravy base.
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When you fold in the sour cream and sharp cheddar cheese, the mixture instantly transforms into a tangy, rich sauce that binds the dish together.
The shredded hash browns act exactly like tiny culinary sponges, aggressively soaking up that incredible homemade cheese sauce as the casserole bakes.
Baking the dish allows the ambient oven heat to evaporate excess moisture, leaving you with beautifully crispy, caramelized edges.
You ultimately get a magnificent textural contrast between the creamy, melt-in-your-mouth interior and the satisfying crunch of the toasted cheese topping.
Ingredients
30 oz frozen shredded hash brown potatoes thawed
2 tbsp olive oil
1 yellow onion diced
3 large garlic cloves minced
1/4 cup all purpose flour
2 cups whole milk can use reduced fat if needed
1 cup chicken stock
1 cup sour cream
8 oz shredded sharp cheddar cheese
1 1/2 tbsp minced parsley can use dried parsley if needed
Salt to taste
Fresh cracked black pepper to taste
1 cup shredded sharp cheddar cheese for the topping
Instructions
Preheat & Prep: Preheat your oven to 350°F (175°C) and lightly grease a 9×13-inch casserole baking dish.
Sauté Aromatics: Preheat a medium pot over medium heat on the stove-top. Add the olive oil, heat it through, and add the diced onions. Sauté the onions until they start to brown and soften.
Add Garlic: Smash and mince the garlic cloves and add them to the onions. Stir and sauté for about one minute until highly fragrant.
Create the Roux: Sprinkle the all-purpose flour over the onions and stir well. Stir constantly for a few seconds to cook out the raw flour taste.
Add Liquids: Start slowly pouring in the chicken stock while whisking or stirring continuously to prevent lumps. Pour in the milk immediately after the stock while stirring as well.
Thicken Sauce: Let the liquid mixture heat through and start to thicken into a creamy gravy.
Add Cheese & Seasoning: Remove from the heat. Stir in the sour cream, the 8 oz of shredded sharp cheddar cheese, salt, and fresh cracked black pepper. Let the mixture sit for a moment so the cheese melts into the thick sauce. Taste the sauce carefully to make sure you have enough seasoning, then stir in the minced parsley.
Combine: In a very large mixing bowl, gently toss the completely thawed hash browns with the warm cheese sauce until the potatoes are thoroughly coated.
Transfer to Dish: Spread the potato mixture evenly into the prepared 9×13 casserole dish. Make sure it is spread in a uniform, flat layer.
Bake: Spread the remaining 1 cup of shredded cheddar cheese evenly over the top. Bake uncovered for 35-40 minutes, until the casserole is beautifully browned and bubbling around the edges.
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