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["Whisk together the flour, sugar, and salt. Work in the butter with your fingers, pastry blender or food processor until pea-sized lumps of butter are still visible, and the mixture holds together when you squeeze it. If you've used a food processor, transfer the mixture to a large bowl. Whisk the first egg and milk together and stir them into the dough, mixing just until everything is cohesive, kneading briefly on a well-floured counter if necessary.", "Divide the dough in half and shape each half into a smooth rectangle, about 3x5 inches. You can roll this out immediately or wrap each half in plastic and refrigerate for up to 2 days. (I refrigerated overnight and found that the dough was still a bit crumbly so I put the dough back into the food processor after refrigerating and pulsed it 6-8 times, then formed it into a rectangle and rolled it out. Worked like a dream and the pastry was still oh so flaky!)", "Assemble the tarts: If the dough has been chilled, remove it from the refrigerator and allow it to soften and become workable, about 15 to 30 minutes. Place one piece on a lightly floured work surface, and roll it into a rectangle about 1/8? thick, large enough that you can trim it to an even 9? x 12?. [You can use a 9"" x 13"" pan, laid on top, as guidance.] Repeat with the second piece of dough. Set trimmings aside. Cut each piece of dough into thirds - you'll form nine 3? x 4? rectangles.", "Beat the additional egg and brush it over the entire surface of the first dough. Place a heaping tablespoon of peanut butter into the center of each rectangle followed by a teaspoon of the jam mixture, keeping a bare 1/2-inch perimeter around it. Place a second rectangle of dough atop the first, using your fingertips to press firmly around the pocket of filling, sealing the dough well on all sides. Press the tines of a fork all around the edge of the rectangle. Repeat with remaining tarts.", "Gently place the tarts on a lightly greased or parchment-lined baking sheet. Prick the top of each tart multiple times with a fork; you want to make sure steam can escape. Refrigerate the tarts (they don't need to be covered) for 30 minutes, while you preheat your oven to 350u00b0F. Bake them for 20 to 25 minutes, until they're a light golden brown. Spoon a tablespoon of powdered sugar glaze on top of hot pastries. Cool in pan on rack."]
