Check the link below.

Here is a link that might be useful: Brownies

Here's one that sounds good.

Pumpkin Brownies (Stonewall Jackson Inn Bed & Breakfast)
Ingredients:
1 15-ounce can of pumpkin
1 ¼ cups vegetable oil
4 eggs
1 cup brown sugar
1 cup granulated white sugar
2 cups flour
1 teaspoon baking soda
1 teaspoon baking powder
1 teaspoon cinnamon
½ teaspoon allspice
½ teaspoon salt
1 container whipped topping or cream cheese frosting (optional)
Preheat oven to 350 degrees. Beat together eggs, oil, pumpkin, and sugars. Stir in remaining ingredients until evenly mixed. Pour into a greased and floured 9-by-13 inch baking dish.

Bake for 30 minutes, or until center springs back when touched.

Top with whipped topping or cream cheese frosting! Great way to use those left over pumpkins!