Defrost the hashed browns in the fridge overnight or on the counter for several hours. Once defrosted, place the potatoes in a strainer and squeeze out all the extra liquid. I use a paper towel or clean dish towel to get out as much moisture as possible.
Preheat the oven to 425 degrees. In a large bowl mix the potatoes, onion, eggs, flour, salt, garlic powder and pepper until well combined. If mixture seems very wet, add a couple more tablespoons of flour. Mixture should be slightly wet, but able to hold together if pressed gently.
Grease a baking sheet with avocado oil. Don't be shy, you don't want the potatoes to stick! Scoop about a golf ball sized amount of the mixture and form a flat pancake like latke with your hands. Try to make sure the latke is the same thickness throughout so it cooks evenly. It doesn't have to be perfect, they're meant to look rustic and those crispy edges are the best!
Bake for 20 minutes on one side, then flip and bake for 10 more minutes. You can do two batches at the same time or remove the first batch and continue. Latkes can be kept warm in a 170-200 degree oven until ready to eat!
Serve with applesauce, sour cream or your favorite toppings!