A lunchbox classic in bar cookie form.
Preheat the oven to 375°F. Lightly grease a 9-inch square baking pan and line with parchment paper so it extends over 2 sides.
Prepare the dough for:
Press two-thirds of the dough into the prepared pan. Spread over the dough:
Crumble the remaining dough over the jam or jelly. Sprinkle on top:
Bake until firm, about 25 minutes. Let cool completely in the pan on a rack before cutting into bars. Store in an airtight container for up to 2 weeks.