Preheat oven to 400°. Cook pasta according to package directions. Meanwhile, place cottage cheese in a food processor; cover and process until smooth. Set aside.
In a large saucepan, melt 1/2 cup butter. Stir in flour, salt, pepper and garlic salt until smooth. Gradually add cream and milk. Bring to a boil; cook and stir 2 minutes or until thickened.
Drain macaroni; transfer to a large bowl. Add cheddar cheese, cottage cheese, white sauce and 3/4 cup bacon; toss to coat. Transfer to a greased 13x9-in. baking dish. (Dish will be full.) Melt remaining butter. Add bread crumbs; toss to coat. Sprinkle over casserole.
Bake, uncovered, 20 minutes. Sprinkle with remaining bacon. Bake 5 minutes or until bubbly.