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Place the peanut butter, dried currants, dried bananas, 3/4 cup walnuts, vanilla, and salt into a food processor and turn it on for 2-3 minutes or until it forms into a ball, stopping to push the ingredients down from the side as needed.
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Remove the dough from the food processor and place onto a waxed sheet of paper or parchment sheet. Press into a ball. Place a second piece of waxed or parchment paper on top of the ball and roll it out to about 1/2 inch thickness with a rolling pin. Press the edges back in as needed.
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Chop the remaining walnuts up into small pieces. Remove the top waxed or parchment paper and sprinkle the walnuts on top. Place the paper back on top and gently roll the walnut pieces partway into the cookie dough.
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Remove the waxed or parchment paper and cut into squares.
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Place in the refrigerator for 1 hour to firm back up. Store in the fridge to keep firm.