Baking double chocolate muffins

I really like the chocolate muffins from Choc N Spice at Shunfu Mart, so I have been trying to find a good recipe that will give me nice soft muffins. There were a few I shortlisted and this afternoon I chose one recipe to bake these nice looking muffins. The only variation I did was to put walnuts or cranberries on top. I think it's quite chocolatey but somehow it's still not as soft as I like. I shall see what my family says tomorrow when they eat them.