1. Preheat oven to 350 degrees Fahrenheit. Grease ramekins.
2. In the bowl of an electric mixer, combine peanut butter, butter, confectioners’ sugar, eggs, egg yolk, and vanilla.
3. Fold in dry ingredients. Add mixture to ramekins.
4. Bake for 15–18 minutes. Watch carefully; you want your cakes to be runny. Let cool and invert.
5. Warm jam and spoon onto plate; place inverted molten cakes onto warm jam.