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Lightly grease a 9x13 inch baking pan and line with parchment paper. Preheat oven to 350 degrees F.
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In a food processor mix together the flour, sugar and baking powder.
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Pulse in the cold butter and vanilla until crumbly.
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If you don't have a food processor you can simply rub the butter through the dry ingredients with your hands, this is a pretty simple, fail-safe recipe.
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Press half of the crumb mixture into the bottom of the prepared pan, then spread on the strawberry jam. Use homemade or a good quality, whole fruit jam and not a pectin based, jelly type jam
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Press the remaining crumb mixture together in your hands and break off small pieces, scattering them evenly over the jam layer.
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Bake for 40-50 minutes or until light golden brown on top.
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Serve warm with ice cream or chill and cut in bars.