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Preheat oven to 350° F.
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Cream butter and sugars together (preferably with the paddle attachment of a stand mixer. An electric mixer will work reasonably well).
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Add peanut butter, egg, and vanilla. Mix well.
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Add flour, baking soda, and salt, mix until just blended.
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Place half the batter in a fluted tart pan and press dough down and against the sides firmly. Add more batter if required to create a firm base. (I always had some batter leftover which I made into regular cookies. Scoop by about 2 tablespoons leftover cookie batter, spacing by about 2", on a tray and bake for approximately 10 minutes or just set).
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Place tart pan in the fridge and allow crust to chill for 10-15 minutes.
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Bake crust for 20 minutes or until crust has turned golden brown and a toothpick comes out clean. The crust will have puffed up. Using a measuring cup base (or another flat surface) press down on the middle base of the crust to release the air (leave the sides as is). Allow to cool in pan.
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While crust is cooling melt chocolate in a small heatproof bowl set above a pot of simmering water (or in short bursts in the microwave). Stir in whipping cream.
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To assemble, place jam in the tart pan and top with chocolate ganache. Allow chocolate to set before cutting, about 30 minutes.