Bake potatoes for 1 hour 15 min on a parchment or foil lined baking sheet until fork tender, about 1 hour.
Lower oven temp to 350 °F.
Allow potatoes to cool and cut in half. Using a cookie scooper or a spoon scoop out the inside of the potatoes, leaving a thin layer of potato still attached to the skin. Place removed potato in a large mixing bowl.
To the potato flesh in the bowl add ¾ of the bacon, 1 cup cheddar, ½ of the blue cheese, the sour cream, heavy cream, ¾ of the green onions, salt, pepper, onion and garlic powder. Mix until fully combined.
Divide the potato mixture between the skins. Sprinkle with remaining cheese. Bake in the oven 20 minutes. Top with remaining blue cheese crumbles, remaining bacon and remain green onions.