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Preheat the oven to 350 F. Grease skeleton skull baking mold with cooking spray.
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In a large bowl, combine the flour, sugar, baking powder, baking soda, and salt. Set aside.
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In a medium bowl, combine the bananas, eggs, butter, and vanilla.
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Using a rubber spatula, fold the wet ingredients into the dry ingredients, mixing until incorporated.
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Divide the batter between the skeleton skull mold cups, filling each about ⅔-¾ full.
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Bake for 25-30 minutes or until a toothpick inserted into the center of the cake comes out clean.
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Let the cakes cool in the pan for 10 minutes before removing and cooling completely on a wire rack.