I will eat straight peanut butter. Out of the jar or on bread -- white, wheat, rye, Portuguese, ciabatta, I don't care. Or on crackers. Ritz preferred, but like the bread, most any will do. until about 5 years ago, it had to be crunchy. Then I just stopped eating crunchy and started preferring creamy.
I will also eat Jam (not jelly), but it's got to be raspberry, with seeds, and preferably Malkin's Canadian Jam in a can, although my second choice, oddly enough is Aldi's house brand. On crackers, or on whole wheat toast. No substitutes.
But I will NOT eat Peanut butter and Jam (or Jelly) together, under any circumstances.