Preheat oven to 350 degrees. Lightly grease a 9 inch square pan.
Beat together eggs, sugars, oil and pumpkin.
In a separate bowl, mix together flour, baking powder, cinnamon, baking soda, salt, and nutmeg. Add to egg mixture and stir well.
Mix in raisins and nuts, and pour into pan.
Bake 55 minutes or until lightly browned and a toothpick inserted in the center comes out clean. *Should be a cake consistency* Cool and spread with Browned Butter Frosting. Cut into bars and enjoy!
***I updated this recipe after the first comment about it, I had made a typo on the baking time and occasionally it takes even longer to bake than that, just do the toothpick test to gauge the doneness, sorry about the confusion!***.
Browned Butter Frosting:
Melt margarine over low heat until light brown.
In a large bowl, stir together powdered sugar, vanilla and margarine. Gradually add hot water, stirring until frosting is smooth enough to spread.