Ohhhh, that's awesome!

https://catinfo.org/making-cat-food/

This is the website I learnt what to do.

Her info is a bit scattered, I had to write down the suggestions and formulate it myself.

I'll post my particular recipe tmr in a separate reply as a reference, but it's necessary that you read her info to decide what's best for your cats based on their ages, weights, health conditions, etc. and your preference of what ingredients to work with.