PREP WORK - Preheat oven to 350º. Spray the bottom and sides of a 9x13-inch baking pan or a bundt pan.
In a medium size bowl, beat the cake mix, eggs, and butter until smooth. If using, add the chocolate chips and mix just until the chips are well incorporated throughout the batter. Pour the batter into prepared baking pan. Spread the pie filling on top of the cake batter (do not stir or attempt to mix together the cake batter and pie filling; they will blend naturally during the baking process). Sprinkle the top with the chopped nuts.
Bake for 50 to 60 minutes or until a toothpick inserted in center of cake comes out clean. Cool for 15 minutes.
In a small bowl, mix the sugar and water until well blended. With a spoon, drizzle the sugar mixture over the cooled cake.