Directions:
Fill piecrust with yogurt and smooth the top; freeze until yogurt is completely firm, about 1 hour.
Preheat oven to 425ºF.
Using an electric mixer, beat egg whites in a large mixing bowl until frothy; add cream of tartar and beat until soft peaks form. Gradually add in sugar while beating mixture and continue to beat until peaks are stiff and glossy; beat in vanilla. Immediately spread meringue mixture over frozen pie, making sure to spread meringue to the edges of the dish. Using the back of a spoon, make swirling motions to form a decorative top; place pie on a baking sheet.
Bake until meringue is golden, about 3 to 5 minutes. Slice into 10 pieces and serve immediately.
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