Chill Dough: Form the dough into a disk, wrap it in plastic wrap, and refrigerate for at least 30 minutes.
Make the filling: In a medium bowl, melt the butter in the microwave and then whisk together the melted butter, brown sugar, corn syrup, eggs, vanilla extract, and salt. Stir in the raisins and pecans (if using).
Assemble the tarts: Preheat the oven to 375 degrees F (190 degrees C). Grease a mini muffin tin. On a lightly floured surface, roll out the dough to a thickness of about 1/8 inch. Cut out circles of dough using a 2-inch biscuit cutter. Place the dough circles in the mini muffin tin. Pour the filling 2/3 of the way into the dough cups.
Bake: Bake for 15-20 minutes, or until the crust is golden brown and the filling is bubbly. Let cool in the pan for a few minutes before serving.