Spray a regular Bundt pan with Baker's release spray or grease and flour (not included in ingredient amount, but hey...)
Stir together the cake mix, pie filling, eggs and 1/4 cup of sour cream to make a smooth batter and spread in Bundt pan.
Bake for 40-50 minutes (I did 45) or until a toothpick comes out without wet batter sticking to it.
Cool 15 minutes in pan, then turn out of pan and finish cooling on a wire rack.
Stir together the remaining quarter cup of sour cream with the powdered sugar, (adding water if needed to thin to a drizzling consistency) and drizzle over cake.