Preheat oven to 350. Lightly grease 13x9 baking dish. Stir egg, vanilla, and sugar together in a bowl. In a smaller bowl, stir salt, baking soda, and flour. Once blended, add to the egg mixture and stir until well mixed. Pour into prepared pan.
Prepare the filling:
Place cream cheese into a mixer bowl beat cream cheese until smooth; add pumpkin purée. Add eggs and vanilla. Dump flour, pumpkin spice, and confectioners’ sugar and mix well. Reduce mixer speed then slowly drizzle in melted butter. Mix well.
Pour pumpkin filling into pan over crust mixture and spread evenly. Bake for 55 minutes or until the center is slightly set. Cool completely before cutting.
Notes
Keep an eye on bars during the last 10 minutes, as the oven temperatures may vary.