Preheat oven to 350°F (175°C).

Grease and flour a 9-inch square baking pan.

In a large bowl, beat together eggs, sugar, brown sugar, vegetable oil, and canned pumpkin until well combined.

In a separate bowl, whisk together flour, baking powder, cinnamon, baking soda, salt, and ground nutmeg.

Gradually add the dry ingredients to the wet ingredients, stirring until just combined.

Fold in raisins and chopped nuts.

Pour the batter into the prepared baking pan and spread evenly.

Bake for 35 minutes, or until a toothpick inserted into the center comes out clean or with just a few moist crumbs.

Let the bars cool completely in the pan.

Spread with your favorite frosting.

Cut into 1 x 3-inch squares.

Refrigerate to chill before serving.