1. Heat oven to 425 degrees.
2. Lightly grease cookie sheet.
3. Mix tuna, olives, celery, green pepper, onion and 1/4 cup of the soup.
4. Mix baking mix and 1/2 cup cold water until soft dough forms: beat vigorously 20 strokes.
5. Gently smooth dough into ball on floured cloth-covered board.
6. Knead 5 times.
7. Roll dough into rectangle, 14 x 11 ; place on cookie sheet.
8. Spoon tuna mixture lengthwise down center of rectangle; sprinkle with 1 cup of the cheese.
9. Make cuts, 2 1/2 long, at 1 intervals on 14 sides of rectangle.
10. Fold strips over filling.
11. Mix egg and 1 tbsp water; brush over dough.
12. Bake until light brown- 15 to 20 minutes.
13. Mix remaining soup, remaining 1/2 cup cheese and the milk over medium heat, stirring occasionally until hot.
14. Serve over slices of twist.