Combine blueberries, graham cracker crumbs, flour, baking powder and baking soda. Add all at once to egg mixture and beat until smooth. Pour batter into prepared baking pan. Bake for 50 to 60 minutes, or until top is richly browned. Cool completely on wire rack.
Garnish cake slices with dollops of sweetened whipped cream and sweetened blueberries.
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