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Preheat oven to 350 degrees F
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Line 9 x 13 baking dish with parchment paper
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Combine the flour, sugar, salt and baking powder in large bowl
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Mix together the Greek yogurt, vanilla, eggs and butter
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Add the wet ingredients to the dry and mix until dough forms
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Press half of the mixture into bottom of prepared pan
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Sprinkle with half of the brown sugar/cinnamon topping
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Drop spoonfuls of the remaining dough over the cinnamon mixture and spread out
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Sprinkle with remaining cinnamon mixture
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Bake 30 - 35 minutes
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Cool slightly