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Heat oven to 350F degrees.
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In small bowl, combine all crust ingredients.
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Mix until crumbly.
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Press onto bottom of a 13 by 9 inch baking dish.
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Bake for 15 minutes.
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Meanwhile, in large bowl, combine all filling ingredients, except the rhubarb.
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Beat at medium speed until smooth, about 2 minutes.
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With spoon, stir in rhubarb.
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Pour over hot crust and continue baking for 45-50 minutes or until filling is firm to the touch.
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Remove from oven and increase temperature to 400F degrees.
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In large bowl, beat egg whites until soft peaks form, about 2 minutes.
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Add salt and vanilla.
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Continue beating while gradually adding sugar.
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Beat until stiff peaks form.
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Spread over hot filling (being sure to seal around edges so meringue doesn't shrink as it cools).
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Continue baking for 6-8 minutes or until meringue is golden brown.
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Cool completely; store refrigerated.