Magnifying glass effect on screenshots

I use Snagit to capture screenshots on my PC and saw the picture below that has a magnifying glass effect on it. I tried to recreate it on Snagit but the magnify options are pretty basic and I don't like the output.

How can I achieve this rather easily without too much complex photo editing? It would be counter productive for me to spend more than 5 minutes editing each screenshot I take, so I am looking for the best practice here.