• Preheat the oven to 350℉. Spray a 9x13 baking pan with nonstick cooking spray. Set aside.
• In a large bowl, using an electric mixer, beat together the dry cake mix, eggs, Dr Pepper soda, and vegetable oil until combined well. About 1 minute. Start at low speed and increase speed as needed. 
  1 box (13.25 oz) german chocolate cake mix, 3 large eggs, 1¼ cups Dr Pepper, 1/3 cup vegetable oil
• Stir in the mini chocolate chips. Pour the chocolate cake batter into the prepared pan and spread into an even layer. 
  1/2 cup mini chocolate chips
• Bake for 25-32 minutes.

  ^{* The cake is done when a toothpick comes out clean, the cake bounces back when tapped, and the edges of the cake have slightly pulled away from the sides of the pan.} 
• Remove the cake from the oven and allow it to cool at room temperature while you prepare the frosting. 

Make The Chocolate Fudge Frosting

• Add the melted butter into a medium sized mixing bowl. Slowly whisk in the milk, while whisking constantly, until a creamy mixture forms.

  ^{*If the batter starts to clump, warm the bowl in the microwave for about 10 seconds. If you're whisking the milk in slowly enough it won't clump.}
  1/2 cup (1 stick) salted butter, 1/3 cup whole milk
• Add in the cocoa powder and whisk until it's smooth and combined.
  1/2 cup cocoa powder
• Add in the powdered sugar, 1/2 cup at a time, whisking continuously until smooth and completely incorporated. Whisk in the vanilla extract until smooth. 

  ^{*At this point the frosting might get too thick, so switch over to a wooden spoon, rubber spatula, or an electric hand mixer to finish mixing everything together.}

  ^{**You can also add some Dr Pepper into the frosting if it's too thick or if you just prefer it thinner to pour over the cake.}
  2½ cups powdered sugar, 1 teaspoon vanilla extract
• Pour/spread the chocolate frosting over top of the warm cake. Immediately add the chopped pecans on top of the frosting. 
  1/3 cup chopped walnuts
• Slice and serve the cake warm or serve it at room temperature once the frosting has had time to set.