Combine dates and baking soda in a bowl. Pour boiling water over dates and let stand for 10 minutes.
Preheat oven to 350°F. Grease 9” round springform pan or cake pan and line with parchment paper.
In food processor** blend date mixture until smooth.
Add butter, sugar and vanilla to processor, pulse until combined.
Add eggs one at a time, pulsing after each addition.
Add flour, baking powder and salt. Process until combined.
Pour mixture into prepared pan. Bake in preheated oven for 50-55 minutes until the cake pulls away from the sides and looks done. Cool completely on wire rack.