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Heat oven to 350 degrees F (177 degrees C).
In a bowl, whisk together the flour, baking soda, cinnamon and salt together. Set aside.
Mash the banana with a fork in a separate small bowl. Add the sugar and whip the banana and sugar together.
Add the melted butter, the egg yolk, and the vanilla; mix well.
Mix in the dry ingredients just until incorporated.
Pour the batter into a lightly buttered 8-ounce ramekin or other baking dish of similar size.
Bake for 30 minutes, until golden brown.
Remove from the oven and cool slightly before eating.