Preheat your oven to 400°F (200°C). Scrub the russet potatoes well and pierce each several times with a fork. Rub them with olive oil and sprinkle with a little salt. Place the potatoes on a baking sheet, then bake for 45-60 minutes, or until tender when pierced with a fork. Once done, let them cool slightly.
While your potatoes bake, shred your cooked chicken breasts or thighs using two forks. In a skillet over medium heat, cook the turkey bacon until crisp. Remove and crumble into small pieces.
Cut the baked potatoes in half lengthwise and carefully scoop out the insides into a large mixing bowl. Leave a small border so the skins maintain their shape. Mash the potato flesh slightly with a fork, then add milk, sour cream, garlic powder, onion powder, salt, and pepper. Mix until creamy and well combined.
Add the shredded chicken, crumbled turkey bacon, chopped green onions, and half of the shredded cheddar cheese to the mashed potatoes. Stir everything together gently until evenly mixed.
Transfer the potato mixture back into the potato skins or spread evenly in a greased baking dish for a casserole style. Sprinkle the remaining cheddar cheese evenly over the top. Bake at 375°F (190°C) for 20-25 minutes, or until the cheese is melted and bubbly with golden spots.
Let the casserole cool for 5 minutes before serving. Garnish with extra green onions or chives if desired. Serve alongside a fresh green salad or steamed veggies for a complete meal.