This looks like a birds nest fungus in the mulch not a slime mold. The spores are commonly found in mulch and when weather conditions are conducive, they will create the 'fruiting bodies' and when they mature they will sporulate. In the case of birds nest fungus, after sporulation, the fruiting body resembles a birds nest. It can shoot spores but does not shoot as far as artillery fungus. The artillery fungus is a smaller organism. The fungus is not dangerous and does not harm you or the surrounding plants. 

There are no easy solutions for prevention/removal of artillery fungus. Some suggest refreshing the mulch, use a bark mulch, not a wood mulch, etc. Here is our page on mulch. Scroll down to Mulch Problems. Take a look at the link from Penn State on What is Growing in My Mulch and what can be done.

Also, take a look at the links from Penn State for FAQ's and solutions for artillery fungus. You may have to experiment to see what works best for you.

https://extension.umd.edu/hgic/topics/mulch

 https://extension.psu.edu/what-is-growing-in-my-landscape-mulch-mushrooms-slime-molds-and-fungus

Marian