Sift the flour, baking powder, and salt together and set aside. Cream together the butter and sugar in the bowl of a stand mixer. Add in the vanilla extract, followed by the eggs, scraping down the bowl between additions. Add in the peanut butter and paddle until smooth. Mix in the dry ingredients until combined. Spread 2/3 of the dough onto a half sheet tray that has been lined with greased parchment paper. Spread the jam on top of the dough and crumble the remaining dough on top. Bake at 350ºF/176ºC for 20 to 25 minutes or until golden brown. Allow to cool completely in the sheet pan.
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