With 23 different flavors, no wonder people started adding Dr Pepper to their cakes.
Chocolatesheet cakeswere popular among early 20th-century cooks from Kentucky to California.
Dr Pepper cake takes its cues from those recipes.
Credit: Antonis Achilleos; Food Styling: Emily Nabors Hall; Prop Styling: Kathleen Varner
Coat a 17 12- x 12 12-inch rimmed baking sheet with cooking spray.
Whisk together flour, sugar, baking soda, cinnamon, and salt in a large bowl.
Add cola mixture; whisk until blended.
Whisk in eggs, buttermilk, and vanilla.
Pour batter into prepared baking sheet.
Reduce heat to low; whisk in cola and milk until blended.
Gradually add powdered sugar, whisking constantly until blended.
Pour warm icing over warm cake; gently spread in an even layer.
Cool completely in baking sheet on a wire rack, about 1 hour.
