1 pkg. yellow cake mix
1 pkg. instant pistachio pudding mix
1 c. Sprite
1/2 c. oil
Mix all of the ingredients until they come together. Do not worry about any clumps in the batter, they will cook out.
Spray a bundt pan with non stick cooking spray and pour the batter into the pan. Smooth out the top in an even layer. Bake for 40-45 minutes until golden brown on the outside. Let cool for 5 to 10 minutes in the pan and then transfer to a cooling rack. Let cool before slicing and serving.