Bake Potatoes: Preheat oven to 400°F. Wash potatoes and poke holes with a fork. Bake for 45 minutes until tender.
Cook Chicken: Season chicken with salt, pepper, and half the garlic powder. Cook in a skillet with 1 tablespoon olive oil until done. Cool and dice.
Prepare Shells: Cut cooled potatoes in half lengthwise. Scoop out flesh, leaving 1/4 inch. Brush with remaining olive oil and season with remaining garlic powder, salt, and pepper.
First Bake: Increase oven to 450°F. Bake potato shells cut-side up for 10-12 minutes until crispy.
Add Toppings: Fill shells with diced chicken and top with cheese.
Final Bake: Bake 8-10 minutes until cheese melts and bubbles.
Serve: Cool for 2-3 minutes. Top with sour cream and green onions.