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No need to refrigerate peanut butter either, although the kinds that have the oil separated on top benefit from being mixed and refrigerated so it stays blended. It's just a convenience thing. But for most of your peanut, almond, and cashew butters, a dark cupboard is just fine. When the weather warms, you peanut butter lovers can churn up this peanut butter frozen yogurt. Now that, you freeze.