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In a bowl, mix together the eggs, vanilla, and sugar until well blended.
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Add in the flour of your choice and the baking powder.
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Slowly mix in the coffee and butter (it will help if the butter is melted). Stir together until all ingredients are mixed. The consistency will be that of a dessert cake batter.
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Pour the batter into a greased 8x8 baking pan. Bake at 350 degrees for 15 minutes.