Gather all ingredients.
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Whisk heavy cream and half-and-half together in a large bowl.
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Gradually whisk in sugar until blended, then whisk in vanilla.
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Cover and refrigerate until very cold, at least 3 hours or up to 3 days.
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Remove from the refrigerator and whisk mixture to blend.
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Pour into an ice cream maker and freeze according to the manufacturer's instructions, about 20 minutes.
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Transfer to an airtight container and freeze until firm, about 4 hours.
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