Once the cake is cooled completely, carefully transfer the cake onto a flat surface. Cut out 2-inch circles using a round cookie, or biscuit cutter
. You will get about 35-40 circles, depending how close you cut out the circles. Place the cutout cake layers on wire rack. Pipe about heaping tablespoon of frosting on half of the cake circles. Using an offset spatula lightly spread the frosting and sprinkle candies pecans. Then top with remaining plain cake layers. Frost the second layer the same way and finish with more candied pecans. Store in the fridge, covered, for up to 3 days.