Preheat oven to 350 degrees. Grease a 9 x 5 loaf pan with cooking spray, set aside. In a large bowl combine pumpkin, egg, brown sugar, oil, sour cream and vanilla extract.
Fold in the pumpkin spice, flour, baking powder, baking soda, salt just until just combined.
Pour 2/3 of the batter into the prepared pan.
Meanwhile prepare the cream cheese filling by whisking all of the ingredients in a medium bowl.
Pour the cream cheese filling on top of the batter spreading it out gently with a spatula.
Pour the remaining batter on top carefully spreading it as well.
Bake for 45-50 minutes or until a toothpick comes out mostly clean. Cool in the pan for 15 minutes before removing to a wire rack to cool completely.