For whatever reason, I cannot find that option in the shortcuts app 
I wonder if it might be device specific (seems weird, but it’s the only reason I can think of, unless the search function is just not working correctly)
edit: Figured it out, there is no direct restart action, you must choose shutdown, and then set shutdown to restart.
edit 2: I like how the grumpy emoji pushes its way through the strikethrough, made me chuckle.
Siri also natively recognizes “Reboot”, “Shutdown”, and “Power off” but asks for similar confirmation. Although I typically say “Reboot my phone” as she doesn’t always get the context with just “Reboot”.
Sharing because I went a year without realizing this 
I don’t know the answer to your question, but your comment did make me realize that from the disabled biometrics state you can then press vol up + vol down + hold power off and that will perform a hard reset getting you into BFU.
Yea there’s no instant BFU solution as of now.
Every shortcut will still require you to push the button for confirmation but they can be quicker depending on your situation. If I’m in a stressful quick thinking situation, swiping that power off button may kill a extra second or two vs clicking 2 buttons.
Scenario: Your phone is in your pocket, you realize it needs to be in BFU ASAP
Pull out the phone, screen lights up, tap shortcut , tap shutdown, looks less suspicious than panic tapping a button several times or holding buttons.
For anyone new reading this thread be sure to check out the quickest factory reset (find my bypass). This is the fastest kill switch like option on iOS.
I really wish Apple would create a quicker and more convenient way to restart or shut down an iPhone. I really like Google’s method, where I can press the power and volume up buttons to get a menu to restart or shut down. It’s obvious, fast, and intuitive. I always do this before I go through passport control in the US.
Is there any way to enable shutdown/restart without having to provide a password or facial recognition? If you don’t have facial recognition registered, when trying to shut down you’ll have to enter the password, and that takes quite a while.
Another thing I noticed is that the automatic restart/shutdown also doesn’t work. It’s configured, but it doesn’t restart/shut down the phone at the set time.
My guide is for iPhones at a normal unlocked/locked state that doesn’t require the password. You will not be able to automate a scheduled shutdown/restart since it still requires user input.
The normal shutdown method that always works is holding down left volume button + power button
Yes a restart at least. I posted this method earlier in the thread and here is the Apple article.
Edit: I missed @iHateKYC2’s method of vol+power+slide as well. So 2 options.
New information about mitigating iOS notification remnants.
I have a few questions…(sorry if I’m dumb)
Do I need iCloud+ or an Apple ID to perform this hardening?
And does it work on other Apple OSes (like iPadOS) as well?
And can I configure a MDM profile via Windows VM on Qubes (and using iMazing)
I am noob in Apple devices XD
Thanks a lot.
You don’t need an Apple ID or iCloud+ to perform this hardening. I just recommend it for convenience. If you’re supervising your device using a MacBook you will need an Apple ID for the initial download of Apple Configurator.
Yes you can do this with your iPad as well. iPads with m-series chips are the most secure apple devices as they can’t even be accessed in a AFU state yet.
As long as apple drivers/usb passthrough are working it should work on Qubes.
iPads with A17 and A16 are secure too?
I wasn’t aware of the Stolen Device Protection. Thanks for sharing that. The settings it enables sound like fine defaults, it’s a shame they are part of this setting since it requires “Find My iPhone”. Initially I thought: “Sure, let’s enable Find My iPhone” and sign out of iCloud (I really don’t wish to use iCloud) but Apple doesn’t seem to fall for that, so unfornately I’ll be disabling the Stolen Device Protection again. 
Correction: after logging out it seems I can still leave the Stolen Device Protection on (even though “Find My iPhone” should now be off again). I’ll take it .
But for using Find My iPhone you don’t have to use iCloud, only AppleID.
Hm… It could well be that I got confused. At least I’m glad that I can use the Stolen Device Protection without having to be logged in to any online service.