Mix together the first 6 ingredients, beat for 2 minutes on medieum to high speed. Fold in the apples and 1/2 cup of the pecans. Pour into well greased bundt pan. Bake for 45-50 minutes (I go by the amount of time for a bundt cake on the cake mix box).
For topping: in sauce pan melt together the butter and the brown sugar until sugar is desolved. Add in the vanilla. Add in enough powdered sugar to make a frosting consistancy, then add in enough milk to make it thin enough to drizzle on the cake. Add in 1/2 cup pecans. Drizzle over the cooled cake.