Preheat your oven to 350°F (180°C). Grease and line a 9-inch (22 cm) cake pan with parchment paper.
In a medium bowl, whisk together the flour, baking powder, and a pinch of salt. Roughly chop the walnuts.
Melt the butter and stir in the granulated sugar. Add the eggs, one at a time, and whisk until light and fluffy.
Mash the bananas with a fork and fold them into the egg mixture. Stir in the vanilla extract.
Gradually add the flour mixture to the wet ingredients, mixing until just combined. Fold in the chopped walnuts.
Pour the batter into the prepared cake pan and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean. Let the cake cool in the pan.
In a chilled bowl, whip the heavy cream with the powdered sugar until stiff peaks form. Gently frost the top and sides of the cooled cake with the whipped cream.
Decorate the cake with banana slices and toasted walnuts. Refrigerate for at least 1 hour before serving.
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