Line bacon on a deep sheet pan, place in oven with potatoes and cook 15-20 minutes until desired texture and crispness is met. Pull bacon out and place on a paper towel lined plate to absorb any excess grease. Crumble or cut cooked bacon into small pieces. Add 1/2 of the cooked bacon into large bowl with cooked potatoes.
Lower oven temperature to 350 degrees.
Add sour cream, butter, 1/2 of the green onions, 1 cup shredded cheese, salt, pepper, and garlic powder. Mix well using a potato masher or an electric hand mixer.
Stir in 1 cup mayonnaise.
Spread mixture into a 9 x 13 baking dish. Sprinkle the rest of the cooked bacon, cheese, and green onions all over the potato mixture. Bake in preheated oven for 30 minutes.
Serve with Ruffles potato chips to dip with. Enjoy.