Combine oats and dry ingredients. Add butter; beat at low speed until crumbly. Reserve 1 1/2 cups and press remaining on bottom of greased 13x9 inch pan. Bake at 375 degrees F. for 10 minutes.
For Frosting: Beat together all ingredients. Spread over partially baked crust; sprinkle remaining crumb mix over pumpkin mix. Continue baking 25 minutes. Cool. Chill. Cut into bars. Can freeze up to 2-3 months. That at room temperature (still wrapped) for 2-3 hours.
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