1. Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish with butter or non-stick spray.
2. Place the diced potatoes in a large pot and cover with cold water. Add a pinch of salt. Bring to a boil and cook until tender but not mushy, about 10-12 minutes. Drain well.
3. In a large mixing bowl, combine the cooked potatoes, sour cream, melted butter, garlic powder, and milk. Stir gently to coat the potatoes evenly. Season with salt and pepper to taste.
4. Fold in 1 1/2 cups of the shredded cheese, the crumbled bacon, and green onions. If you’re adding vegetables like corn or peas, fold them in here as well.
5. Transfer the mixture to your prepared baking dish, spreading it evenly. Sprinkle the remaining 1/2 cup of cheese over the top for a golden crust.
6. Bake uncovered for 25-30 minutes, until the casserole is bubbly and the cheese on top is melted and slightly browned.
7. Remove from the oven and let it rest for 5 minutes before serving. This helps the casserole set and makes it easier to scoop.

One of my favorite memories is when Ouma and I would sneak into the kitchen early, trying to sample the cheese topping while it was still too hot to touch. Mama Lou would catch us every time, laughing and reminding us that good things come to those who wait. Patience is key here—it really makes the flavors meld beautifully.