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Preheat the oven to 350 degrees F. Line cookie sheets with parchment paper.
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Sift the flour, baking powder and salt into a bowl and set aside.
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Melt the unsweetened chocolate, chopped bittersweet chocolate and the butter in a double boiler over low heat, stirring constantly.
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With a hand mixer beat together the eggs, sugar and vanilla on medium-high speed until light in texture and thick, 3 to 4 minutes.
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Add the chocolate mixture and blend thoroughly.
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Turn the mixer on low speed, mix in the dry ingredients until just combined. Mix in the pecans and chocolate chips until blended.
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Fill a 1/4 cup ice cream scoop with dough, level it, and drop the dough onto a prepared cookie sheet, leaving 3 inches between the cookies.
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Bake the cookies until they are cracked on top, about 14 minutes. Cool on wire racks.