In large bowl mix sugar, oil, eggs and pumpkin puree together well.
In a medium bowl, mix or sift together flour, baking powder, baking soda, cinnamon, salt, and nutmeg.
Add dry ingredients to pumpkin mixture and mix thoroughly.
Pour into an ungreased 10 X 15-inch baking dish.
Bake at 350F for 25-30 minutes or until a toothpick comes out clean.
Let cool.
Cream Cheese Frosting
Let cream cheese and butter come to room temperature.
Cream butter, then add cream cheese and beat until fluffy.
Mix in vanilla.
Add powdered sugar and mix on low until smooth.
Use a spatula to distribute mounds of frosting over the top of the pumpkin bars. Use spatula to gently smooth the frosting across the top of the pumpkin bars.
Cut into squares or bars and serve.
Notes
I use avocado oil (or olive oil) for a tender texture and subtle flavor. Any neutral vegetable oil works.
Use fine sea salt for even distribution and balanced sweetness.
The cream cheese frosting is lightly sweetened—add more powdered sugar if you prefer it sweeter or thicker.
Let the bars cool completely, approximately 1-2 hours, before frosting to prevent melting.