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Pre-heat oven to 350 degrees
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Combine flour, oatmeal, 1/2 cup brown sugar and 1/2 cup butter in mixing bowl. Mix until crumbly, using a mixer on low speed.
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Press into greased 13 x 9 pan.
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Bake at 350 degrees for 15 minutes. Remove from oven and set aside.
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Combine pumpkin, milk, eggs, sugar, salt, pumpkin pie spice and vanilla in mixing bowl.
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Pour into crust and bake for 20 minutes.
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While squares are baking, combine nuts, 1/2 cup brown sugar, and 2 tablespoons of butter.
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Sprinkle topping over pumpkin squares. Return to oven and bake for an additional 15-20 minutes until pumpkin filling is set.
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Cool completely and cut into 15 squares.