OVEN TEMP: 350 SOFTEN YEAST FROM ROLL MIX IN quarter CUP WARM WATER. COMBINE THE MIX AND quarter CUP SUGAR. STIR IN THE YEAST, EGG, SOUR CREAM AND BUTTER. MIX WELL. PLACE DOUGH IN GREASED BOWL, TURNING ONCE. COVER AND CHILL 2 TO 3 HOURS. TURN DOUGH ONTO FLOURED SURFACE. ROLL THE DOUGH INTO A 46 cm CIRCLE. FIT INTO A 6 CUP MOLD RING, ALLOWING SOME DOUGH TO HANG OVER THE EDGES.(DOUGH WILL COVER THE CENTER HOLE.) BEAT CREAM CHEESE, SUGAR AND VANILLA TILL SMOOTH. ADD EGGS, ONE AT A TIME, BEATING WELL AFTER EACH ADDITION. POUR INTO MOLD. BRING DOUGH FROM SIDES OVER THE TOP OF FILLING. SEAL TO CENTER OF MOLD. CUT AN X IN THE DOUGH COVERING THE CENTER HOME. FOLD THE FOUR TRIANGLES BACK OVER TOP OF RING, SEALING TO OUTER EDGES. LET RISE UNTIL ALMOST DOUBLE, 1 TO 1.5 HOURS. BAKE 35 TO 40 MINUTES OR UNTIL WOODEN PICK INSERTED INTO FILLING COMES OUT CLEAN. COOL IN THE PAN 10 MIN. TURN OUT ON A RACK, SPRINKLE WITH CONFECTIONERS SUGAR AND SERVE.