Ingredients

1 large egg
1 cup butter, softened butter
1 cups granulated sugar
1 cup pureed pumpkin
1 cup walnut pieces ^[1]

2 cups all-purpose flour
1/2 teaspoons baking soda
1 teaspoon baking powder
1/4 teaspoon salt
1 teaspoon cinnamon
1/2 teaspoon allspice
1/4 teaspoon ginger

Directions

Preheat the oven to 350 degrees.

1. In the bowl of your stand-type mixer and with the paddle attachment, mix the eggs, soften butter, sugar, pumpkin, and walnuts ^[1] together.
2. In another bowl, whisk the flour, baking soda, baking powder, salt, cinnamon ^[2], allspice, and ginger together.
3. Add the dry ingredients to the wet ingredients and continue beating until combined.
4. Line a 13 x 9-inch pan with parchment paper or grease and flour.  Pour the batter into the pan and smooth it until it is level.  Bake for 25 minutes or until a toothpick inserted in the center comes out clean.
5. Cool on a wire rack in the pan.  If you are using parchment paper, grab the edges of the paper and lift the cake onto a cutting board.  Frost the cake.  Cut it into bars to serve.

For the frosting

4 ounces cream cheese
1 teaspoon vanilla
2 cups powdered sugar
1 to 2 tablespoon milk

1. Beat the cream cheese in a small bowl until it is fluffy.  Add the vanilla.  Gradually add the powdered sugar.
2. Beat in enough milk to reach the desired spreading consistency.