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1
Place 1/4 cup of the milk, 1 teaspoon of the vanilla extract, and the banana in a blender and blend to mix thoroughly, about 30 seconds.
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2
Add the vanilla ice cream and pulse several times to begin breaking it up.
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3
With the blender motor off, use a flexible spatula to mash the mixture down onto the blender blades.
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4
Continue pulsing, stopping, and mashing until the mixture is well blended, thick, and moves easily in the blender jar, roughly 30 to 90 seconds.
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5
Pour the shake into a small pitcher, and refrigerate while making the other flavor (if you have two blenders, keep the shake in the blender jar).
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6
If necessary, rinse the blender jar, shake out any excess water, and return it to the base.
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7
Place the remaining 1/4?
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8
cup milk, the remaining 1/4 teaspoon vanilla extract, and the chocolate ice cream and sorbet in the blender and pulse several times to begin breaking up the ice cream and sorbet.
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9
With the blender motor off, use a flexible spatula to mash the mixture down onto the blender blades.
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10
Continue pulsing, stopping, and mashing until the mixture is well blended, thick, and moves easily in the blender jar, roughly 30 to 90 seconds.
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11
Into one or two tall, chilled glasses, pour a layer of VanBan shake, followed by a layer of chocolate, another layer of VanBan, another layer of chocolate, and finishing with a last layer of VanBan on top.
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12
Serve at once.
