Preheat oven to 375 degrees F. Line two baking sheets with cooking parchment, or spray baking sheets with vegetable oil spray. Set aside. In a large mixing bowl, stir or beat prunes and sugars together until soft and creamy. Using a rubber scraper, fold in egg whites and vanilla. In a medium bowl, stir together flour, cocoa powder, baking soda, and salt. Stir into prune mixture, blending well. Stir in chocolate chips and chunks. Drop by heaping teaspoonfuls onto baking sheets. Moisten palm of your hand with water; slightly flatten each cookie to about 2 inches in diameter. Bake for 10 minutes, or until firm. Transfer cookies, still on cooking parchment, to cooling racks. To prevent sticking, remove cookies from cooking parchment as soon as they cool.
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