Combine brown sugar, corn syrup, baking soda, salt, shortening, eggs, and vanilla extract in a mixing bowl.

Gradually add flour and mix until a dough forms.

Chill the dough in the refrigerator for about 30 minutes to make it easier to roll out.

Preheat oven to 350°F (175°C).

Roll out the chilled dough on a lightly floured surface.

Cut out circles from the dough using a cookie cutter.

Place one circle of dough on a baking sheet.

Add 1/2 teaspoon of jam to the center of each circle.

Cover with another circle of dough, sealing the edges to enclose the jam.

Bake for about 15 minutes, or until golden brown.

Let the cookies cool on a wire rack before serving.