What I do is simply write down notes around a problem and solution and them dump the notes on a post as briefly as possible. Usually the blogging itself is minimal effort.

Another method is just "scaling" up a conversation. People often talk frequently about the same topics, like tips on how to start freelancing, how to scale up a startup, and the answers are often the same but take minutes to type up each time. For this, it's useful to just write it once and then expand in full in a blog.

I recommend not trying to keep to a regular schedule of blogging, because this will force you to write sloppy, unless you're doing constant experiments on a topic and want to post updates.