Ingredients
This recipe was developed by @mindycakess. For more recipes of hers, please check out her website.
Directions
- Preheat oven to 350 degrees and line a square (9x9 or 8x8) baking dish with parchment by paper.
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In a large mixing bowl combine the flour, sugar, baking powder, baking soda and salt.
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Add the softened butter one tablespoon at a time mixing on low speed until no large chunks of butter remain
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Add the egg and mashed banana, mix to combine
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Slowly add the buttermilk, mixing on low speed. Add the vanilla and oil and mix until smooth. Fold in the walnuts
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Spread the batter into the prepared pan and bake 30-40 minutes.
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To make the frosting beat the butter, powdered sugar and walnut butter together until light and fluffy. If the frosting is too thick add milk one tablespoon at a time.
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Spread the frosting over the cooled cake and decorate with more chopped walnuts