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Export 7 ingredients for grocery delivery
Step 1
Preheat the oven to 350 degrees Fahrenheit. Afterward, grease and line with parchment paper on a 9×13 baking dish.
Step 2
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.
Step 3
After that, add the Chocolate cake box mix into the saucepan and continuously stir using a rubber spatula.
Step 4
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.
Step 5
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.
Step 6
Finally, place in the wire rack to cool down; make sure that the cake is icy before cutting or frosting.
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