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Preheat the oven to 350 degrees Fahrenheit. Afterward, grease and line with parchment paper on a 9×13 baking dish.
Afterward, heat a saucepan in medium heat and stir in the butter, oil, cocoa powder, and Dr. Pepper. After that, allow to simmer, stir well until incorporated, then remove from heat.
After that, add the Chocolate cake box mix into the saucepan and continuously stir using a rubber spatula.
In another bowl, whisk in the buttermilk and egg until smooth and combined. Gradually add the buttermilk mixture to the saucepan and mix until well incorporated.
After that, pour the mixture into the cake pan and bake in the oven for about 25 to 30 minutes, or you can insert a skewer in the center, and if it comes out clean, then it is done.
Finally, place in the wire rack to cool down; make sure that the cake is icy before cutting or frosting.