Cream 1/2 cup sugar with butter. Add eggs and applesauce. Add dry ingredients alternately with yogurt. Mix until combined. Mix together remaining sugars with 1tbsp of flax and pecans. Divide both dough and topping into two equal in halves. Put half dough into pan top with half the topping. Repeat. Bake 325 for 35 mins. 9x13 pan.