INGREDIENTS
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1/2 c. melted butter, plus more for buttering pan
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1 c. all-purpose flour, plus more for flouring pan
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1/2 c. cocoa powder
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1 tsp. baking soda
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1/4 tsp. kosher salt
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3/4 c. sugar
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1/4 c. buttermilk
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1 tsp. vanilla extract
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1 large egg plus 1 large egg yolk
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1 c. semisweet chocolate chips
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3 super-ripe bananas, mashed