Connecting two monitors to Mac mini

1111me wrote:

How do I connect two independent monitors to my Mac mini using a HDMI splitter?

You don't, you connect both to the Thunderbolt 3/USB-C ports or one to the HDMI port and one to a Thunderbolt 3/USB-C port. see > Connect multiple displays to your Mac mini (2018) - Apple Support

The HDMI port cannot handle two different displays. Connect the second display to a Thunderbolt port with the appropriate adapter or cable.

Yes, but you can only use one at a time i.e. a splitter with an A/B switch.

A Mac mini can run at least two displays simultaneously. No switches or splitters are needed. What year is your Mac mini, and what model displays?