re: I have one extra raised garden bed. What should I put in it?

I made my raised beds out of Trex deck boards,expensive but durable.Had them 10 years and holding up well.My old house used Wolmanized 2x12’s,lined with plastic,was pia.Made my wife bed for roses with landscape timbers,they only lasted about 5 years.Known people used cross ties but they rot surprisingly fast with soil contact plus I was concerned about leaching of creosote into the soil.
On the plus side I don’t have to fool with tiller,making rows,etc.Raised beds are the only way to go as far as I’m concerned.I like fresh vegetables but don’t like all the work that goes into conventional gardening.