Preheat the oven to 400°F. Wash and dry the potatoes thoroughly. Prick each potato with a knife or fork, rub them lightly with olive oil, and season with salt and pepper. Bake for about 1 hour or until they are fork-tender. Remove them and let cool for a few minutes.
Cut the top of each potato lengthwise. Carefully scoop out the flesh, leaving about a ¼-inch layer to keep the skins intact. Transfer the scooped potato into a mixing bowl.
In the bowl with the potato flesh, mix in butter, salt, pepper, chives, sour cream, garlic powder, chicken bouillon, and milk. Mash everything together until smooth, adjusting the milk to reach your desired consistency.
Spoon the mixture back into the potato skins, packing it gently. Top each filled potato with shredded cheddar cheese. Bake in the oven at 350°F for about 15 minutes, or until the cheese is bubbly and golden.
Notes
For make-ahead convenience, prepare the potatoes without the second baking step and refrigerate them for up to a day.
If you want to freeze them, flash freeze the filled potatoes and store them in a freezer-safe container for up to 3 months.
Enjoy with toppings like crispy beef bacon bits or fresh herbs for added flavor and crunch.