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Preheat oven to 350°.
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In a mixing bowl, blend the flour, margarine and brown sugar until crumbly.
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Reserve 1 cup of mixture aside.
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Press the remaining crumb mixture into an 8x8" baking pan.
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Bake for 15 minutes.
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In another bowl, whisk eggs, white sugar, vanilla and yogurt together.
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When the crumb crust is done baking, pour the egg mixture on top.
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Sprinkle the 1 cup of crumbs that had been set aside on the top.
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Bake for 20 more minutes.
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Cool before serving.