Preheat your oven to 375°F (190°C) and grease a 9x13-inch baking dish with olive oil.
Cook the sliced frankfurters over medium heat until browned. Set aside.
In a large bowl, whisk together the eggs, milk, garlic powder, onion powder, salt, and black pepper until well combined.
Spread the thawed hash browns evenly in the prepared baking dish, pressing them down slightly.
Pour the egg mixture over the hash browns, then layer the cooked frankfurters and shredded cheese on top.
Optionally, sprinkle chopped green onions for added flavor.
Bake in the preheated oven for about 35-40 minutes, or until the eggs are set and the top is golden brown.
Remove from the oven and let it rest for a few minutes before slicing. Serve warm and enjoy!
