In a bowl, mix dry ingredients , set aside
In a separate bowl, mix chocolate chips and chopped walnut, set aside
In another bowl, using a wire whisk, combine egg, sugar, margarine and pumpkin
Stir in dry ingredients followed with chocolate chip and walnut mixture
Spread batter evenly on a greased loaf pan and baked at preheated 350 F for 55 minutes (until knife inserted in center comes out clean)
Cool inside the pan for 10 mins, take out of pan and cool completely on rack (for about 2 h), before glazing
Mix icing sugar and milk, stir and drizzle on cooled bread
Let icing harden for 30 mins then slice