Mix cream cheese and softened unsalted butter in a stand mixer. Add in three cups of flour. Mix well. Wrap and place in the fridge for 1 hour. 

Place a quarter of the dough on a dough board and roll out to a thin layer. Cut into 1 1/2 inch squares. Place jam in the center and pinch together opposite sides. Rub a little water on the place where you pinched together in order to keep them together when baking. 

Preheat oven to 350 degrees F. Place the cookies on a baking sheet lined with parchment paper. Bake for 13 minutes. Remove to cooling rack. Dust with powdered sugar. Store in airtight container.