Cream butter and sugar until fluffy.Add eggs and vanilla, then mix well.Combine dry ingredients and add to the dough.Chill dough for 1 hour.Cook filling ingredients until slightly thickened, then cool.Roll dough into thin rectangles.Spread filling evenly over dough.Roll into logs and slice or shape.Bake at 350°F for 15 to 18 minutes.Cool and dust with powdered sugar.