You would think, with such a strong flavor such as root beer, that this Root Beer Cake would be almost too strong. This is from the Cake Mix Doctor but adapted. There is not a lot of “root beer” taste, but it gives it a really great moisture to the cake. Add the granulated and brown sugars and whisk until dissolved. Blend in root beer and beat until desired consistency. Beat mixture at low speed with an electric mixer until dry ingredients are moistened. Make the Cake: Preheat oven to 350 degrees F. Grease and flour 2 (9-inch) cake pans and line the bottoms with parchment paper. Root Beer Float Cake Recipe: How to Make It | Taste of Home Pour into a greased and floured 12" x 8" pan. With root beer in the batter AND in the frosting, it’s a party when this cake is served! Believe me, it’s not! Pour batter into a greased and floured 13- x 9-inch pan. This is a chocolate root beer cake. The cake mix dr. recipe is the lemon-lime cake w/ pineapple curd if you want to know what itw as originally. For Frosting: In a medium bowl, beat together butter, salt, powdered sugar and milk. Apply frosting to cooled cake. This Root Beer Cake is such a fun dessert! Remove from the heat and let cool. Combine first 4 ingredients in a mixing bowl. Bake at 375 degrees F for 30 to 35 minutes. Spread onto cooled cake. It goes great w/ root beer … Heat 2 cups root beer, the cocoa powder, chocolate and 1 stick butter in a large saucepan over medium heat until the butter melts.