Mix together all the ingredients of bowl 1 and bowl 2 in two separate bowls, pour wet ingredients in a dry ingredients bowl and mix well with a spatula, do not use electric beater batter will be lumpy, and pour in muffin cases.
Now prepare the coffee topping, mix together topping ingredients and rub in chilled butter, sprinkle the topping on each muffin cup over the batter and bake for 20 mins on 180 d.