Preheat oven to 400 degrees.
Scrub potatoes, then use a fork to poke 8-12 deep holes all over the surface of each potato to let the moisture escape during cooking.
While potatoes are cooling mix sour cream, salt, pepper, bacon, and cheeses in a bowl. Set aside.
Place on a baking sheet and bake for 45-55 minutes. Preheat oven to 350 degrees.
Let cool slightly, then cut in half, lengthwise and scoop out potato flesh into a large bowl.
Add softened butter, softened cream cheese, half and half, garlic salt, 1 1/2 cups shredded cheddar cheese, 1 1/2 cups shredded mozzarella cheese and all but 1/4 cup of chopped bacon. Salt and pepper to taste.
Pour the mixture into a lightly greased 9x13 baking dish. Top with remaining shredded cheeses, bacon, and green onions or chives.
Bake at 350 for 30-35 minutes and serve warm.