Add dates and water to a medium saucepan. Bring to a boil over medium-high heat then add baking soda and boil, stirring occasionally, 1 minute longer. Remove from heat, cover saucepan with lid and rest 10 minutes, then puree (the water and dates) in a food processor or blender. Set aside to cool.
In a mixing bowl whisk together flour, baking powder and salt for 20 seconds, set aside. In the bowl of an electric stand mixer fitted with the paddle attachment, cream together butter and brown sugar until mixture become lighter in shade.
Mix in egg then mix in egg yolk and vanilla extract. With mixer set on low speed, add in half of the flour mixture and mix until combined, then mix in pureed date mixture and finish by mixing in remaining half of the flour mixture.
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