Prep: Heat the oven to 350°F and spray a 15x10x1-inch pan with cooking spray.
Batter: Use an electric hand mixer to combine the pumpkin, sugar, oil, eggs, and vanilla.
In a separate bowl, whisk the flour, pumpkin pie spice, baking powder, cinnamon, baking soda, and salt. Stir the dry ingredients into the wet pumpkin mixture, just until combined.
Pour the batter into the prepared pan.
Bake: Place the pan in the preheated oven and bake for 20 minutes, or until a toothpick inserted into the middle comes out clean.
Frosting: Beat the cream cheese, butter and vanilla together, then sift the powdered sugar into the cream cheese and beat until combined.
Cool the cake completely, then ice the cake and serve. Slice, serve, and enjoy!