For the Ketchup, since I have tried and just dislike making my own ketchup a lot, I use Hunts brand. There are no corn syrups, just a few ingredients, and it’s affordable. Even when you make ketchup at home you add sugar, it just doesn’t taste right without it!
I used whole milk, but any milk will work, including almond or soy!
An optional ingredient would be cheese, just mix it in with the rest of it before putting it into the muffin cups.