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preheat oven to 350.
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scrub then pierce skin of sweet potatoes.
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bake 40 mins or until soft enough to mash, cool until easy to handle.
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cut potatoes in half and scoop pulp into large bowl and mash.
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add in 1/2 cup butter, sugar, 1/4 cup amaretto, marmalade, and salt.
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beat until just combined.
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add in remaining 1/4 cup butter and amaretto.
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mix until blended.
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using food processor or blender finely grind cookie mixture and set aside.
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in greased 13 x 9 in baking pan evenly spread potato mixture.
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sprinkle with cookie mixture on top.
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bake for 35-40 minutes.