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In a mixing bowl, beat egg whites and vanilla until soft peaks form.
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Gradually add sugar, about 2 Tablespoons at a time, beating until stiff peaks form.
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Gently fold in cocoa.
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Place in a pastry bag with a large open star tip.
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Line baking sheets with foil and coat the foil with nonstick cooking spray.
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Pipe stars, about 1 1/4 in.
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diameter, onto foil, or drop by rounded teaspoons.
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Bake at 300 for 30-35 minutes or util lightly browned.
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Remove from foil; cool on wire racks.
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In a microwave or double boiler, melt chocolate and shortening; stir until smooth.
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Dip the cookies halfway into glaze; place on waxed paper to harden.