01 -
Heat your oven to 350°F (175°C). Coat a 9x13x2 baking pan with cooking spray and put it aside.
02 -
Dump the cake mix and Dr. Pepper Cherry into a big bowl. Whisk them together until the mixture looks smooth.
03 -
Pick out 24 cherries from the jar and take off their stems. Cut each one into four pieces. Mix these cherry chunks into your cake batter so they spread out evenly.
04 -
Empty the batter into your greased pan and smooth the top flat with a spatula. Stick it in the middle of your oven for about 30 minutes. You'll know it's done when you poke it with a toothpick and nothing sticks.
05 -
While your cake bakes, grab your stand mixer with the whisk attachment or a hand mixer and a big bowl. Beat the butter until it's super fluffy, around 3 minutes. Slowly add the powdered sugar, one cup at a time, making sure it's mixed in well before adding more. Pour in 6 tablespoons of the cherry juice and beat everything until your frosting gets light and fluffy.
06 -
Wait for the cake to cool down completely. Then spread your cherry buttercream all over it and top with the leftover cherries as decoration.