Preheat your oven to 350F. Prepare a 10X15X1 baking sheet by spraying it with cooking spray. In a mixing bowl, stir together the flour, sugar, baking powder, pumpkin pie spice, baking soda, and salt.
2 cups all-purpose flour, 1 ½ cups granulated sugar, 3 teaspoons pumpkin pie spice, 2 teaspoons baking powder, 1 teaspoon baking soda, ¼ teaspoons salt
Stir in the eggs, pumpkin and softened butter until combined.
4 eggs, 1 15-ounce pumpkin puree, 1 cup butter
In a separate bowl, combine the cream cheese, sugar and egg. Start beating on a low speed and then increase to medium-high. This will take a few. minutes, but the cheesecake filling will look glossy, silky and smooth when it's ready.
1 8-ounce cream cheese, 1 egg, ½ cup granulated sugar
Spread thin, uneven dollops all over the top of the pumpkin bar batter. Use a knife or chopstick to swirl through the cheesecake and batter, being careful not to scrape the bottom of the pan.
Run the knife back and forth, diagonal and side to side until you are satisfied with the marble pattern. Bake for 25 minutes or until a toothpick inserted into the center comes out clean.
Set the hot pan of pumpkin bars with cream cheese swirls on a wire rack and let it cool for up to two hours before cutting and serving.
The cheesecake swirled pumpkin bars can be cut into traditional squares. It can be sliced into big pieces and will make 24 bars, or small pieces and can be stretched to 48 bars. When I am cutting it into 48 pieces, I like to make my 24 squares and then cut each square in half diagonally to make cute little triangles.