I have two sites in my Masa installation. Where do I put custom functions that i want to be able to use in both sites? Now I have them in the

contentRenderer.cfc

for each site. Creating a

contentRenderer.cfc

in my sites folder does not seem to work.

You could create a utility cfc and add that to a custom key in the Masa Scope. If you do that in a module of plugin, early in the event livecycle, it will be available in your site. https://docs.murasoftware.com/v7-1/mura-developers/mura-scope/#section-setcustommurascopekey