Dogdanz,
I had the same exact problem as you, yes, it is mold.
I got rid of it.
You have to be careful with mulch.
I didn't want to take a risk of harming my plants, in particular, roses.
Now I don't have to worry.
Get rid of it.

Fungus is one of the micro organisms converting your mulch to compost. It does look like mold and is normal. As the vegetative matter is shredded by the larger micro organisms the bacteria can continue the conversion. Stirring it up adds oxygen and speeds the process. The end result is nutrients that feed your plants. Al

It is the natural process of the continued decomposition of the mulch. It is totally harmless. It is NOT mold but fungal mycelia. As calistoga stated, this is a food source for soil microorganisms (in fact, various fungi are typical soil microorganism themselves) which results in the natural processing of plant nutrients.

If the mulch is intended for winter protection, you can simply leave it in place for now, although there is really no need to mulch container plantings during the growing season.