When wiring a panel that has a number of devices requiring power it is good to have some sort of "power distribution buss". In control panels it is common to have a separate distribution buss for L1, L2, Neutral and Ground.
While you say you are only putting together a bare-bones system, a power buss gives you an easy way to expand it in the future if you add pumps, or other devices.
The buss can just be a terminal strip where you can connected other devices like your controller with any size of wire and terminal you choose.
As you mentioned, the EZ-boil has smallish terminals due to its minimal power requirements. You could use a 16 gauge wire to connect it to your main power distribution buss.
Trying to distribute power in a "daisy chain" fashion, the way you describe, can be done, but is much more difficult and you need to know how to do it in a way that doesn't unintentionally limit power to any given device. That's the advantage of using a power distribution bus.
A power distribution buss can also incorporate fuses or circuit breakers to protect individual loads.
As an alternative to a power buss, you also could just crimp a smaller gauge wire with a large gauge wire in a suitable crimp terminal to tap off a power lead for the EZ-boil.