I was out of town for about a week, and came back to find these three mushrooms in my pot of Thyme & Oregano. Michigan thumb area, NW exposure and in front of a huge window.

What kind of mushrooms are these, and how do I get rid of them lol? I put the pot up on a bookshelf for the time being since I have a cat that will eat anything organic if the mood strikes. Will just pulling them out stop them? The herbs were sickly late-season purchases and aren't quite 100% healthy again yet, will this hinder them? (The thyme plant the mushrooms are next too was doing ok before but now seems to be a goner).

Also, this pot is between my two Pachiras. Should I be worried about the spores traveling to those pots too?

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Thanks for any info you can give (and I apologize for the size of the pictures),

Kai