I just finished an extension to the kitchen counter. I noticed that when dishes are drying between the stove and the sink, there is very little food preparation area. I made a wood self that extends the counter 18" and folds flat to store in the closet when not in use. It is held in place for four brass pins. There are four aluminum brackets attached to the cabinet base that these are attached to.
Hopefully I read the instructions for attaching pictures to a forum post, if nothing shows up I will have to try again.
Kitchen Counter Extension