Twice Baked Potato Casserole With Bacon!!

2 large baking potatoes 1/2 pound lean bacon 3/4 cup shredded mild Cheddar cheese 1/2 cup sour cream 1/4 cup milk 2 tablespoons unsalted butter, melted 1 teaspoon dried chives 1/2 teaspoon salt 1/2 teaspoon ground black pepper 1/2 teaspoon garlic powder 3/4 cup shredded mild