Preheat oven to 425 degrees F. Grease a 9-by-13-inch pan or coat with nonstick spray; set aside.
In large bowl of electric mixer combine the eggs, sugar, oil, and pumpkin. Beat until light and fluffy. In a medium bowl, whisk together the flour, cinnamon, baking powder, baking soda, salt, and ginger. Add the flour mixture to the pumpkin mixture and mix until thoroughly combined and smooth. Spread the batter in the prepared pan and bake for 35-40 minutes or until a toothpick inserted into the center comes out clean. Remove from oven and cool to room temperature.
For frosting: beat together the cream cheese, butter, and vanilla until smooth. Add the powdered sugar and mix until combined. Spread frosting evenly over cake. Cut into desired size bars to serve. Sprinkle the top with grated nutmeg if desired, or with some finely chopped walnuts or pecans, or leave plain.
Recipe by The Culinary Cellar at https://theculinarycellar.com/time-for-pumpkin/