Creating Steakhouse Potatoes Romanoff is a simple process. Just follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Potatoes: Peel and grate the russet potatoes. Place the grated potatoes in a bowl of cold water to prevent browning, then drain and pat dry.
3. Mix Ingredients: In a large mixing bowl, combine the grated potatoes, sour cream, cheddar cheese, Parmesan cheese, chopped onion, melted butter, garlic powder, salt, and black pepper. Mix well until all ingredients are evenly combined.
4. Transfer to Baking Dish: Grease a 9×13-inch baking dish. Pour the potato mixture into the dish and spread it evenly.
5. Add Topping: In a small bowl, combine crushed cornflakes or breadcrumbs with a drizzle of melted butter. Sprinkle this mixture over the top of the potato mixture for added crunch.
6. Bake: Place the baking dish in the preheated oven and bake for 45 minutes, or until the top is golden brown and the potatoes are cooked through.
7. Cool and Garnish: Once out of the oven, let the dish cool for a few minutes. Garnish with chopped chives if desired.

By following these steps, you’ll create a deliciously creamy and cheesy potato dish that will elevate any meal.