"They're ever-so-slightly crisp on the outside and perfectly soft on the inside...."
INGREDIENTS
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2 sticks (8 ounces) unsalted butter
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1 large egg yolk
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2 cups all-purpose flour
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1 (3.4-ounce) box instant vanilla pudding mix
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1 1/4 teaspoons kosher salt
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1/2 teaspoon baking soda
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1/4 teaspoon baking powder
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24 Nilla wafer cookies
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2/3 cup packed light brown sugar
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1/3 cup granulated sugar
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1 large ripe banana
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1 1/2 teaspoons vanilla extract
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3/4 cup white chocolate chips