Chocolate Butterscotch Babka

Ingredients:
Dough:

75 ml sugar
125 ml hot water 
11 ml quick rise yeast
175 ml butter, softened 
175 ml milk 
2 eggs
5 ml salt
5 ml vanilla
4 cups flour

Filling:

150 ml sugar
75 ml cocoa powder
175 ml butterscotch chips

Topping:

75 ml icing sugar
50 ml flour 
25 ml cold margarine, cubed
1 egg

Directions:

1. In a large bowl, combine 250 ml of the flour, sugar, salt and yeast.
2. Heat water, milk and 50 ml of the margarine until margarine is melted and mixture is hot to the touch but not too hot-should be able to hold your finger in liquid for 10 seconds.
3. Add hot liquids to the dry ingredients and beat well for 2-3 minutes to start the gluten development.
4. Add eggs and vanilla blend well.
5. Add remaining flour 50 ml at a time, to form a soft, slightly sticky dough that will hold its shape. You may not need all the remaining flour.
6. Turn out dough onto a lightly floured surface and knead until the dough is smooth and elastic, 8-10 minutes. Add only enough flour to prevent sticking.
7. Cover with a clean towel and allow it to rest for 10 minutes.
8. On a lightly oiled surface, roll out the dough to a 22 by 10 inch rectangle.
9. Spread remaining butter over dough, leaving 1 inch border uncovered along the side.
10. Filling: In a bowl, sift together sugar and cocoa. Sprinkle cocoa mixture, then the butterscotch chips evenly over butter.
11. Starting with long side without border, roll up jelly roll style. Pinch bottom edge to seal. Twist ends of roll in opposite directions 6-8 times, fit into greased 10 inch tube pan with removable bottom, pinching ends together to seal.
12. Cover and let rise in a warm draft free place until almost double in bulk, 1-1 1/2 hours.
13. Topping:  Meanwhile, in a bowl, stir together icing sugar and flour, using a pastry blender or 2 knives, cut in butter until crumbly. Brush egg over top of dough, sprinkle topping over top.
14. Bake in center of 350 degrees F oven until golden brown, about 35 minutes.
15. Remove outside of pan, let cool on rack. Remove pan bottom.