In a mixer, cream together butter and sugar for 2 minutes. Add vanilla, egg and peanut butter. Mix until well incorporated. Add flour, baking powder and salt. Mix together on low, just until incorporated.
Grease a 9x9 pan. Put 2/3 of the mixture in and press it into the bottom. Spread the jam over the dough layer. Add the chopped peanuts to the remaining 1/3 of the dough mixture. Mix it together (with your hands) until the peanuts are mixed in. Crumble the mixture over the jam layer.
Bake at 350 for 30 minutes. Let it cool for 20 minutes before cutting to let the jam set.
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