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Sundae toppings: whipped cream, chopped salted peanuts, pretzels, dried banana chips, chocolate chips, peanut butter chips, toasted coconut flakes and maraschino cherries
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For the banana ice cream cake: Preheat the oven to 350 degrees F. Butter a 9-by-13-inch baking pan.
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Melt the butter in a medium skillet over medium heat until nutty brown.
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Immediately remove from the heat and reserve.
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Whisk the flour with the baking soda and salt in a medium bowl.
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Vigorously whisk the bananas with the browned butter in a large bowl until very well combined and creamy.
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Whisk the egg, brown sugar, granulated sugar and vanilla into the banana mixture until smooth.
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Fold the flour mixture into the banana mixture with a rubber spatula until well combined.
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Pour the batter into the prepared pan and spread to cover completely; the layer will be thin.
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Bake until a toothpick inserted in the center comes out clean, about 18 minutes.
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Cool completely on a rack, about 1 hour.
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Spread the ice cream evenly over the banana cake with a rubber spatula.
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Cover with plastic wrap and freeze until firm, at least 4 hours or overnight.
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For the chocolate sauce: Combine the chocolate, cream, corn syrup, butter and salt in a medium saucepan over medium heat.
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Whisk periodically as the mixture comes to a gentle simmer.
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Simmer for 5 minutes, stirring occasionally.
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If the sauce starts to boil, turn down the heat.
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Cool 15 minutes before serving.
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Transfer to a bowl or small pitcher.
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(Yield: 1 2/3 cups.)
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For the caramelized bananas: Remove the cake from the freezer and let stand at room temperature.
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Heat a large skillet over medium heat.
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Add the butter and swirl the pan.
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When the butter is completely melted, place the banana pieces cut-sides down in one layer in the pan.
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When they are nicely browned, after 4 to 5 minutes, flip the bananas.
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Cook until the other sides are browned and the bananas have softened, 2 to 3 minutes.
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Transfer to a bowl.
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To serve, place desired toppings in bowls.
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Cut squares of the banana cake and divide among serving bowls.
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Let each person build a sundae with the chocolate sauce, caramelized bananas, and additional toppings.
