1 16 oz box jumbo or classic elbow macaroni
6 slices bacon cooked and crumbled, reserve 2 tablespoon drippings
7 tablespoon butter divided
1 small sweet onion diced
½ cup all-purpose flour
2 teaspoon garlic salt
2 teaspoon ground mustard
1 teaspoon black pepper
4 cup whole milk
4 cups shredded sharp cheddar cheese divided
8 bun length quality all-beef hot dogs. ¼ inch slice 2 green onion thinly sliced