My buns/bread don't brown from top?
Egg wash is an answer. 

Source: http://www.dutchovendave.com/breadbasics.html

[For a shiny crust, brush the top of the bread with an equal solution of whole egg, water and milk. If desired, sprinkle with poppy, caraway or sesame seed or rolled oats.  For a softer, deep golden brown crust, brush with softened butter or margarine.  For a crisp crust, brush or spray lightly with water.  For a soft, tender crust, brush with milk.  After glazing (brushing with one of these ingredients), slash the top of the loaf with a sharp serrated knife, cutting about 1/4 inch deep, once down the center of the loaf or across the loaf a few times.]