Combine first four ingredients in a large bowl. Sift together flour, baking powder, baking soda, salt, and spices; add to pumpkin mixture and mix well. Pour into greased and floured 12 x 8 x 2-inch pan. Bake at 350 degrees (F) for 20 to 25 minutes. Cool. Frost with Cream Cheese Frosting.
Beat together the cream cheese, butter, and vanilla extract, adding enough of the powdered sugar to give desired consistency. Cream can also be added if needed.
Makes 72 bars.
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