Molly's advice is to lay the jar of peanut butter on its side for a little while. The oil moves from being on the surface of the peanut butter to being slicked down the side of the jar. Then it becomes easy to slip the knife through the oil and start working it into the peanut butter.
Kinda brilliant, right?
Molly shared this tip during Spilled Milk podcast devoted entirely to peanut butter. She and her co-host Matthew Amster-Burton tasted their way through several varieties of peanut butter, and made some surprising discoveries along the way.
• Check It Out! Peanut Butter from Spilled Milk
Related: Make or Buy? Peanut Butter