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Preheat oven to 350 degrees F. Line an 8 inch square pan with foil and oil it.
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Combine brown sugar, flour, baking soda, salt, and rolled oats.
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Mix in the butters using a pastry blender or a fork to form a crumbly mixture.
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Press 2 cups of the mixture into the bottom of the prepared pan.
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Spread the jam leaving about a 1/4 inch of the edge. Sprinkle the remaining crumb mixture over the top, and lightly press it into the jam.
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Bake for 35 to 40 minutes in preheated oven, or until lightly browned. Allow to cool before cutting into bars. ENJOY!