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Spray a 9-inch springform pan the nonstick spray. Refrigerate. Microwave the chocolate until melted and smooth, stirring every 20 seconds, for about 1 minute.
Combine the almonds and cookies in processor. Pulse until the almonds and cookies are finely ground. Transfer the nut mixture to a medium bowl. Add the butter and sugar to the processor and blend until creamy and smooth. Add the grated orange peel and pulse briefly, until incorporated. Add the eggs 1 at a time. Blend until the eggs are incorporated. Clean the sides of the mixing bowl and blend again. Add the nut mixture and melted chocolate. Pulse until blended. Clean the sides of the bowl. Blend again.
Transfer the cake to a platter. Sift the cocoa powder over and serve.