Using a clean kitchen towel, wrap the grated potatoes and squeeze out any excess moisture.
In a mixing bowl, combine the grated potatoes, grated onion, beaten egg, flour, salt, and black pepper. Mix until well combined.
Heat up a large skillet on medium-high heat and add the vegetable oil.
Using a ¼ cup measure, scoop the potato mixture and gently flatten it into a patty shape. Carefully place the potato patty in the hot oil and repeat until the skillet is filled with patties.
Cook the potato patties until golden brown, about 2-3 minutes per side.
Transfer the browned potato patties to a baking sheet lined with parchment paper.
Bake the hash brown potatoes in the preheated oven for 10-15 minutes, or until they are crispy and cooked through.
Serve the hash brown potatoes hot, garnished with chopped fresh parsley or green onions, if desired.
Notes
Enjoy your delicious homemade hash brown potato recipe!