Preheat your oven to 350°F (177°C).

Wash the potatoes under cold water, rub with oil, sprinkle with salt, and pierce with a fork. Bake for about 1 hour and 15 minutes until soft.

Let the potatoes cool, then peel and mash them in a large mixing bowl.

Add cream cheese, butter, 1 cup of cheddar cheese, and sour cream to the mashed potatoes. Mix until creamy.

Stir in garlic, salt, and pepper. Ensure seasonings are well distributed.

Grease a 9x13-inch baking dish, spoon the potato mixture into it, and spread evenly.

Cover with plastic wrap and refrigerate if making ahead, or proceed to bake.

Bake uncovered for 30-35 minutes until bubbly and golden on top.

Sprinkle the remaining cheddar cheese on top and bake for an additional 5 minutes until melted.

Let cool for a few minutes, garnish with chives and bacon, then serve.