Beat butter and cream cheese until smooth.
Slowly add flour, mixing until fully incoporated.
Divide dough into 3 balls, and wrap in cling wrap. Chill for about an hour, for easier handling when rolling out dough.
Lightly flour counter or dough board. Roll dough out to about an 1/8 thick. You want it fairly thin.
With a pastry or pizza wheel (or 3" square cookie cutter), cut dough into 3" squares.
Place a teaspoon of filling in center of each square and bring 2 opposite corners together and pinch.
Bake at 350 degrees for 15 to 17 minutes until lightly brown. When cool, sprinkle with powdered sugar.