In a large skillet, cook onion with 2 Tbs butter until caramelized (6-7 minutes)
While the onions are simmering, thoroughly wash each potato and poke a generous amount of holes in each potato using a fork
Wrap potatoes in a layer or two of clear plastic wrap and cook *individually* for 4:40-5:00 minutes, making sure to turn the potato over once halfway through cooking
Once the onions are caramelized, add in green beans, cream of mushroom soup, milk, garlic powder and salt and pepper
Top with shredded cheese and allow to simmer for a few minutes
Cut open each potato and mash the insides using a fork
Add 1 Tbs of butter to the potato before scooping the green bean casserole mixture into the potato
Top with extra cheese, French's Crispy Onions or any of your other favorite baked potato toppings and enjoy!