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Gather all ingredients. Preheat the oven to 350 degrees F (175 degrees C) and grease a 9x13-inch baking pan.
For cake, stir together sugar, flour, cocoa powder, baking powder, baking soda and salt in a large bowl.
Add eggs, Dr. Pepper®, milk, oil and vanilla. Beat with an electric mixer for 2 minutes on medium speed.
Stir in the boiling water. The batter will be thin.
Transfer batter to prepared pan. Bake until a toothpick inserted in the center comes out clean, 30 to 35 minutes.
Let the cake cool in the pan on a wire rack for at least 30 minutes.
For glaze, combine butter, cocoa powder and 3 tablespoons Dr. Pepper® in a medium saucepan. Cook and stir over medium high heat until mixture is boiling. Remove from heat.
Whisk in powdered sugar until well blended, smooth, and creamy, about 2 minutes. Stir in the remaining 2 tablespoons Dr. Pepper to make a smooth glaze.
Pour glaze over cooled cake and let set for 1 hour before serving.