Banana Rum Cake

Step 1
Preheat the oven to 350 degrees F (175 degrees C). Grease and flour two 9-inch round cake pans.

Step 2
Make the cake: Stir cake mix, bananas, rum, water, pecans, eggs, and baking soda in a large bowl until combined, then beat with an electric mixer on medium speed for 2 to 4 minutes. Pour into the prepared pans.

Step 3
Bake in the preheated oven until a toothpick inserted into the center comes out clean, 25 to 30 minutes. Cool pans on a wire rack for 5 minutes. Run a table knife around the edges to loosen cakes; invert carefully onto a cooling rack and let cool completely, about 25 more minutes.

Step 4
Meanwhile, make the frosting: Beat butter in a mixing bowl with an electric mixer until creamy. Gradually mix in confectioners sugar; blend thoroughly. Mix in rum and vanilla until smooth.

Step 5
Spread frosting on cooled cake tops, then stack layers and frost sides.