Air fryer frozen hash browns - Preheat air fryer to 380 if using shredded or 390 if using hashbrown patties for 5 minutes.Spray the inside of your air fryer basket with olive oil spray.
Pour or place hash browns inside (with patties don't overlap them). Spray top with olive oil spray and season with salt and pepper. Cook for 20 minutes total for shredded, or 9 minutes total for patties flipping them over halfway thru the cooking time. Taste, re-season, serve with ketchup.
Frozen Hashbrowns in Oven - Line a baking sheet with parchment paper. Spread them out in a single layer on the baking sheet. Make sure to leave some space between them so they can cook evenly. Drizzle 1 tbsp olive oil over the top. Season with salt, pepper, and garlic powder.
Place the baking sheet in the preheated oven and let them bake and crisp for about 20 to 25 minutes. For crispier results, flip over halfway thru.
Frozen Hashbrowns on Stove - Heat skillet over medium heat and add a tablespoon of olive oil. Once the oil is hot, carefully transfer the hash browns to the skillet. Cook for 3-4 minutes on each side, flipping them gently with a spatula. Add seasonings to each side for added flavor.