Can I leave melted butter out overnight?

Online Answer
According to the USDA, butter is safe at room temperature. But if it's left out for several days at room temperature, it can turn rancid causing off flavors. The USDA does not recommend leaving it out more than one to two days.
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The peanut butter may be contaminated with salmonella, bacteria that cause food poisoning. Suspect jars bear a number on the lid beginning with the digits "2111.