Coca-Cola Cake

Preparation - Preheat the oven to 350°F.

Preparation - Spray a 9x13-inch baking pan with nonstick cooking spray and set aside.

Bloom the cola and cocoa - To make the cake, in a medium saucepan, combine the cola, butter, and cocoa. Bring to a boil over medium-high heat and cook, stirring frequently to make sure it doesn't boil over, until the butter is melted and the ingredients are well-combined, about 7 minutes. Remove the pan from heat and let cool for 5 minutes.

Make the batter - In a large heatproof bowl, whisk together the flour, sugar, baking soda, and salt. Pour the warm cola mixture into the flour mixture and whisk until no dry streaks remain. Whisk in the sour cream, eggs, and vanilla until combined.

Bake - Transfer the batter to the prepared baking pan, spreading it into an even layer. Bake until the edges of the cake begin to pull away from the sides of the pan and a toothpick inserted in the center comes out with a few moist crumbs attached, 28 to 30 minutes.

Bake - Remove from oven and let cool in the baking pan on a wire rack while preparing the frosting.

Meanwhile, make the frosting - To make the frosting, in a large saucepan, bring the cola to a boil over medium-high heat. Boil, undisturbed, until the cola has reduced to 1/3 cup, about 15 minutes.

Meanwhile, make the frosting - Add the butter and cocoa to the reduced cola and continue to cook, whisking constantly, until the butter is melted and the cocoa is thoroughly combined, about 30 seconds.

Meanwhile, make the frosting - Add the powdered sugar and salt and whisk until smooth.

Top and serve - Immediately pour the frosting over the warm cake, spreading it into an even layer. Let the frosted cake rest until cooled to room temperature and the frosting is fully set, about 1 1/2 hours. Slice and serve.