How have I never heard of this before?

Tonight's first Bob's Burgers episode started with a customer commenting how much he liked Bob's burger, even though it had peanut butter on it.

You can put peanut butter on a burger.

I mean, sure, I've put it on bagels with bacon, and made a macadamia butter for mahi-mahi, but this is just something I've never thought of.

This was the first result when I googled it, and that sounds very good.  Burger + cheddar + bacon + peanut butter should work just fine.  Further searching led me to see that Teddy's will put pb on a burger, and that it's actually just on the menu at HBC.

I should try one sometime.