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Heat oven to 250 degrees.
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Line cookie sheets with parchment paper.
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Set aside.
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Bring egg whites to room temperature before making cookies in order to produce the greatest volume when beating.
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In a medium mixing bowl, combine egg whites and cream of tartar.
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Beat at high speed with electric mixer until soft peaks begin to form.
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Add sugar gradually (about 1 tablespoon at a time), while beating at the highest speed of the electric mixer.
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Beat until stiff peaks form.
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Fold in chocolate chips.
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Drop meringue mixture by rounded teaspoons onto the cookie sheets with parchment paper.
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Bake for 25-30 minutes, or until dry.
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Cookies should remain white.
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If they start to toast, turn down the heat and bake until dry.
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I prefer to turn off the oven when complete and let the cookies completely dry out in the residual heat of the oven overnight (I generally bake these cookies at night).