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Preheat oven to 350 degrees. Line an 8x8 square baking dish with parchment paper.
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Stir egg, butter, and cookie mix together until dough forms.
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Evenly press dough into the prepared baking dish.
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Bake for 15-18 minutes or until edges turn golden brown.
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Remove from oven and cool for 5 minutes.
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While cookie base is still warm, spread evenly with the lemon curd.
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In a clean, dry bowl, beat egg whites, cream of tartar, and sugar together until stiff peaks form.
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Spread egg white mixture over lemon curd.
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Bake bars for an additional 3-5 minutes, or until meringue topping begins to turn golden.
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Remove from oven and cool completely then refrigerate for at least 1 hour.
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When ready to serve, cut into squares and serve immediately.