Mix together the flour, sugar, BAILEYS® Coffee Creamer Vanilla Brown Sugar, buttermilk, butter, eggs, baking powder and salt. Mix on low until combined and then beat for two minutes.
In a separate bowl, combine brown sugar, flour, butter and cinnamon with a pastry cutter or two knives until clumps form.
Spread half of the batter in a greased 9×13 inch pan. Sprinkle the batter with half of the cinnamon streusel. Add the remaining batter and carefully spread it out.
Sprinkle with the remaining streusel.
Bake at 350 degrees for 35-40 minutes.
Mix together the powdered sugar and BAILEYS® Coffee Creamer Vanilla Brown Sugar.
Drizzle over the coffee cake before serving.