01 -
Thaw the frozen diced hash browns and drain any excess moisture using a colander.
02 -
Heat vegetable oil in a skillet over medium-high heat. Add diced yellow onions and fry until golden brown and crispy. Remove from oil and let drain on a paper towel.
03 -
In a medium saucepan, melt the butter over medium heat. Add the diced yellow onion and garlic, cooking until softened. Sprinkle in flour and whisk constantly for 1-2 minutes to create a roux. Gradually add chicken broth and milk, whisking until smooth and thickened.
04 -
In a large mixing bowl, combine thawed hash browns, shredded cheddar cheese, sour cream, sauce mixture, salt, pepper, smoked paprika, and ground thyme. Mix thoroughly.
05 -
Spread the potato mixture into a greased baking dish. Top with fried onions, spreading them evenly across the surface.
06 -
Preheat oven to 350°F (175°C). Bake the casserole uncovered for 40-45 minutes, or until golden brown and bubbling.
07 -
Remove the casserole from the oven and let it rest for 5-10 minutes before serving.