INGREDIENTS
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3 1/2 cups chilled heavy cream, divided
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8 ounces Mascarpone cheese
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1/2 cup unrefined granulated sugar
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2 tablespoons Dutch-process cocoa powder
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1 tablespoon pure vanilla extract
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28 squares cinnamon graham crackers
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5 ripe bananas, halved crosswise then sliced lengthwise
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8 ounces coarsely chopped milk or dark chocolate coarsely chopped
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1 tablespoon unsalted butter