After commenting and following a post by MichaelJ, I decided that a picture or two is worth a thousand words. So, here’s how I do it. (I had also posted in the past another way, but I like this method better)
First, remove the blade guard on your planer. Set the fence to the maximum width.
Face joint the board as you normally would, until the jointable surface is flat.
You should now have the flat, jointed surface and the “rabbet” from the overhang.
This is the spacer board, which I made from 1/4” plywood. I also have some made from tempered hardboard.
I made a variety of length, to use with different length boards. I glued a stop block on the end to keep the spacer from slipping out from under the board while planing.
Place the stop block on the infeed side of the board
Set your planer and plane the rough side of the board until flat.
Flip the board over and set planer to remove the “rabbet” and plane to desired thickness.
I haven’t used this on boards wider than 9” – 9.5”. There could be some tilting on boards wider than that. Maybe if someone has some wider boards they could experiment and let us know.