Instructions
Step 1: Preheat and Prepare
Preheat your oven to 375°F (190°C). Grease a 9×13 inch baking dish with butter or cooking spray and set aside.

Step 2: Make the Creamy Base (No Canned Soup!)
In a medium saucepan, melt the butter over medium heat. Add the diced onions and cook until softened (about 3–4 minutes). Stir in the flour and cook for 1 minute to eliminate the raw flour taste. Gradually whisk in the milk to create a smooth sauce.

Once the mixture thickens (about 3–5 minutes), reduce the heat and stir in sour cream, garlic powder, onion powder, salt, and black pepper. Mix well until smooth and creamy.

Step 3: Combine Ingredients
In a large mixing bowl, combine the thawed hashbrowns, cooked chicken, 1 ½ cups of cheddar cheese, and the creamy sauce you just made. Stir everything together gently until well incorporated.

Step 4: Assemble the Casserole
Pour the mixture into the prepared baking dish and spread it out evenly. Sprinkle the remaining ½ cup of cheddar cheese over the top.

Optional: For a crunchy topping, mix ½ cup crushed cornflakes or breadcrumbs with a tablespoon of melted butter and sprinkle over the cheese layer.

Step 5: Bake to Golden Perfection
Bake the casserole uncovered for 40–45 minutes or until the top is golden brown and the edges are bubbly. If you’re using a topping, it should be crisp and slightly toasted.

Step 6: Rest and Garnish
Remove from the oven and let it rest for 5–10 minutes before serving. This helps the casserole firm up slightly, making it easier to serve. Garnish with fresh parsley if desired.

Tips & Variations
Make it spicy: Add diced green chiles, jalapeños, or a pinch of cayenne for some heat.
Veggie boost: Stir in frozen peas, corn, or broccoli florets before baking.
Cheese swap: Try a blend of mozzarella and Monterey Jack for a gooier finish.
Final Thoughts
Chicken Hashbrown Casserole is the ultimate comfort food—rich, cheesy, and endlessly customizable. It’s also freezer-friendly, so you can make it ahead and enjoy later. Whether you’re feeding a large family or meal-prepping for the week, this dish is a guaranteed winner.