Preheat the Oven: Set your oven to 325°F (163°C) to ensure it's ready for baking.
Mix the Ingredients: In a 9x13-inch baking dish, combine the diced potatoes, grated cheddar cheese, crumbled bacon, and sliced green onions. Sprinkle the garlic salt evenly over the mixture.
Add the Mayonnaise: Gently fold in the mayonnaise, ensuring that all ingredients are well coated for a rich, creamy texture when baked.
Bake the Dish: Place the baking dish in the preheated oven and bake for about 1 hour and 30 minutes, or until the potatoes are tender and the top is golden brown.
