I am pretty sure that everyone has this recipe, it has been around for years! My Mom made this way back in the day and I just made one last weekend! It is still the very best to me (of course, it makes me think of my mom and chatting over coffee too)
Blend the cake mix, sour cream, oil, sugar, water and eggs together. Beat for 2 minutes. Pour 2/3 of the batter into a greased and floured 10 inch bundt or tube cake pan. Then the filling sprinkling it evenly around the top of the batter. Pour the remaining batter over the filling . Bake in preheated oven, 375 degrees for 45-55 minutes.