Shaper. Ask your rep at your professional woodworker supply house.

How much do you need? If it's a lot then look for a router bit with a matching profile or, worst case, make a knife for a shaper insert cutter. If you only need a few feet I'd cut a square rabbet on the corner with either a router or table saw then round off the corners by hand with a spokeshave, small plane, or even sandpaper.

Double roundover bit

Not sure what the radius of that curve is, but if it were 1/4”, for example, you could first cut a 1/4 x 1/4 rabbet the length of the board where the face meets the edge. Then use a 1/4” roundover bit along the face. Then use the same bit along the edge.