Either! Depends upon: Crackers or sliced bread, or in a dish's recipe, or with butter or jam, or in a cake. Back in the 40's my Grandfather would keep a 5 gallon bucket of peanut butter available at the bottom of the back stair case.
Hmm.
Question. How do you like your eggs?
Answer. In a cake!
Come to think of it, probably really creamy smooth peanut butter is best. Sometimes natural style no sugar added, other times Skippy!