Creating Steakhouse Potatoes Romanoff at home is simple with these clear steps:

1. Preheat the Oven: Set your oven to 350°F (175°C).
2. Prepare the Potatoes: Wash and peel the russet potatoes. Cut them into small cubes for even cooking.
3. Boil Potatoes: Place the cubed potatoes in a large pot and cover with water. Bring to a boil and cook until tender, about 15-20 minutes. Drain and set aside.
4. Mix Ingredients: In a large mixing bowl, combine sour cream, shredded cheddar cheese, chopped green onions, milk, garlic powder, onion powder, salt, and black pepper. Stir until well combined.
5. Combine Potatoes and Mixture: Add the drained potatoes to the cheese mixture. Gently fold until the potatoes are evenly coated.
6. Transfer to Baking Dish: Grease a 9×13-inch baking dish and pour the potato mixture into it, spreading it evenly.
7. Prepare Cornflake Topping: In a small bowl, mix crushed cornflakes with melted butter until well coated. Sprinkle the mixture evenly over the potatoes.
8. Bake: Place the baking dish in the preheated oven. Bake for 45 minutes or until the top is golden and crispy.
9. Cool Slightly: Remove from the oven and let it cool for a few minutes before serving. This helps the dish set up nicely.

Following these steps will help you achieve a creamy, cheesy, and delicious dish that will delight your guests.