Cognative therapy in laymans terms is just brainstorming and sloving a problem - any problem past or present by looking at

what the problem is
who is involved
when did it happen
What feelings you felt just before, during and after the situation happened
evidence that supports your feelings and thoughts
eveidence that does not support your feelings and thoughts
and then coming up with your solutions to the problem for the best outcome for you based on the objectiveness of looking at all angles of the problem.

If you are in therapy and woring on solving your problems by looking at all sides of the problem then you are already doing cognative therapy.

You can find an example of how this works in the book Mind Over Mood by Dennis Greenberger, PHD and Christine A Padesky, PHD in the activity called - Thought Record