I'm switching banks. If I write a check out of QB, how do I record it?

Unless ALL the outstanding checks have Cleared, you may want to do this in a couple of steps.

In answer to your main question, Create the new Bank Checking Account in QBs.  Write a check from your Old Checking Acct and make the associated Account the new Checking Account.  So QBs will show $100 dollars going out of Old Checking and into New Checking.

If you have any outstanding checks on the old Acct., I'd leave enough money in the Old Checking Acct not to be charged a Fee (or work it out with the bank so you're not charged a Fee).  I'm recommending this because every once in a while someone will do a typo and the original withdrawal is more than you're expecting.  This will stop the auto overdraft fees, etc. and just makes it easier to correct the issue (bank looks at the check and sees what it was really filled out for).  Then once All the checks have cleared, write a check for the final Balance in the Old Checking and send it to the New Checking as you did above by just putting the New Checking Acct in the Account Field.  Then confirm the Account is Closed with the Bank, don't assume it's closed because there is a $0 Balance.

Also be sure to check for any Auto Payment AND Auto Deposits that go to that old account.

Thanks very much for your help. Ah, I see. Go to "write checks," pay to the order of the new bank from the old bank, and put the NEW bank in the expense tab under "account." I now see a check from OLD and a deposit into NEW. Correct?

Sorry, I realized I missed saying you want to Transfer the money. If you go to Write Check, QBs  is going to assume you're paying a Vendor, which you're not.

So basically the same thing, you are going to select New and then Transfer and then pick the Accounts you're transferring between (that's why it's easier if you set up the New Checking Acct first). 

If you write your checks manually, you can still write a check and just make the deposit in the new Bank.  You can go into the Old Checking Register and add the Check Number, or just match it to the Transfer when you do your last Bank Feed.  (Be sure to disable the Bank Feed when you're done with the Acct so QBs doesn't keep trying to sync it.)

If you do Online Check, then go into the Bank and ask for a Cashier's Check (Bank Check) and then use that Check to open the New Checking Account.  I'd probably have them make it out to Cash, but remember that really is CASH then.  So you don't want it sitting on your desk or someplace you could loose it if you're not going directly to the new Bank.  So if you're not going to the bank, have them write it out to you and then you can endorse it to the New Bank.

Now I'm to the point of actually doing this. I use QB desktop, not QB online, and I don't use bank feeds. My online banking portal does not have an option to enter an external bank to do ACH transfers to (dumb) so I need to contact my banker. My preference is to do 99% of the switchover before telling him.

If I write a physical check, I can deposit that to my new bank. When I go to the register and manually enter the check and the check number, I still have to make it payable to a vendor. This will increase expenses which is not correct. So I'm still unclear how to proceed.

I guess I could just go to the branch and do a bank check. That's probably the best way.

Just following up to see if you got everything worked out with the bank and your QBs entries.

@Pete_Mc thanks for the check in! I should have updated this.

I ended up going to the bank and getting a cashier's check. Then I simply did a transfer within QB from one account to the other.

Funny story...I needed two checks. I gave the bank the information and acct numbers on a slip of paper I hand wrote. I accidentally transposed 2 numbers on one of the account numbers. Ooops. But, a couple of hours later they realized they wrote a BIG check to me from someone else's account. Wow. How does that even happen since they had my driver's license right in front of them??

If you only saw the criminally small amount of interest I earn on one account in relation to the balance. It costs me more to pay my employee to walk to the mailbox to retrieve the statement than I earn in interest.

Yep, hence my "few cents" comment.  But I actually had a bank once start charging a monthly fee that had a pretty substantial balance.  Called a couple of times and the fee was reversed.  After the third time I just moved the money as it wasn't worth my time to keep chasing them on the ridiculous fee. 

And you're still getting paper statements?  I do love my PDFs that either come in an email from some banks or I just go get from the others when I'm ready to Reconcile.