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Preheat oven to 350 degrees. Spray 2 8 inch pans OR 3 6 inch pans with nonstick cooking spray.
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Melt butter then combine with graham cracker crumbs and sugar and mix with fork.
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Distribute crumb mixture into pans and lightly press into bottom of the pans.
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To make the cake, beat butter, sugar, and brown sugar until light and fluffy.
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Add eggs and egg yolks one at a time, scraping the bowl before each addition.
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Mix in vanilla.
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In a separate bowl combine cake flour, baking powder and soda, and salt.
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With mixer set to low, alternate adding flour mixture and yogurt mixture into the butter/sugar/egg mixture, beating on low until just combined.
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Distribute batter into pans and bake for 20 minutes or until a knife is inserted and clean when removed.
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Cool for five minutes in pan, then remove from pan and cool completely on a cooling rack.