01 -
Heat the oven to 350°F (175°C). Grease two 9-inch round cake pans and line the bottoms with parchment paper.
02 -
In a large bowl, whisk the eggs, sour cream, milk, oil, mashed banana, and vanilla until smooth. Add the cake mix and banana pudding mix, then whisk until no dry streaks remain.
03 -
Divide the batter between the pans. Bake for 22-26 minutes, until the tops spring back lightly and a toothpick inserted in the center comes out clean.
04 -
Let the cakes cool in the pans for 10 minutes, then turn them onto a wire rack. Cool completely before filling and frosting.
05 -
Beat the cream cheese, powdered sugar, and vanilla until smooth. With the mixer on low, slowly pour in the cold heavy cream, then whip on medium until thick and fluffy.
06 -
Place one cake layer on a serving plate. Spread with about 1 cup frosting, arrange the banana slices in an even layer, and sprinkle with about 1 cup crushed vanilla wafers.
07 -
Top with the second cake layer. Frost the top and sides with the remaining frosting, then press crushed wafers onto the sides and decorate the top with whole wafers.
08 -
Refrigerate the cake for at least 2 hours before slicing. Add any extra fresh banana garnish just before serving.