Blend cream cheese and butter together. Add egg yolks. Mix well. Add sugar. Then add flour, baking powder and salt. Mix well. Dough will be sticky. Form into 2 balls and wrap with wax paper.
Refrigerate at least 2 hours before rolling out to cut. Remove one dough ball at a time from refrigerator. Roll to 1/4-inch thick on floured surface.
Cut with round cookie cutter. Place on ungreased cookie sheets. Top with 3/4 to 1 teaspoon pastry filling on each round.
Bake at 375 degrees for 10 to 12 minutes. Dust with powdered sugar when cool, if desired.