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Preheat oven to 400 degrees and line a baking sheet with parchment paper.
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Mix flour, cinnamon, and baking powder together. Add in cold butter, and mix with a pastry cutter until the mixture resembles coarse crumbs.
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Add in the mashed banana, vanilla extract, maple syrup, milk, and sour cream (or Greek yogurt), and mix until combined.
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Turn the dough out onto a floured surface, and pat the dough into a circle, about 1" thick. Cut into 8 equal triangles.
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Press walnuts onto the tops of each scones.
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Bake for 16-17 minutes, or until lightly golden brown.
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While the scones are cooling, mix butter and cream cheese together until combined. Add in maple syrup and mix until combined. Put cream cheese icing into a pastry bag and drizzle over each scone.
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Enjoy!