Radiused rabbet by hand?

[Aram]

Sometimes I make rabbets (cross or with grain) with a radius at the corner, instead of an abrupt 90 degree transition. One example would be a raised panel in a frame and panel box top, where the slight curvature softens the look. I'm not talking about a curved field. Just a small radius at the corner. It's easy with a power router and a radiused end mill. Has anyone done this by hand? 

I can think of some hard ways to do this, like crazy mods to my rabbet plane. What's the right way?

Thanks.

[knockknock]

Are talking about the inside bottom corner, or the top corner?

[Aram]

Are talking about the inside bottom corner, or the top corner?

Inside bottom. Top I can do with hand planes or files.

[barryvabeach]

Inside bottom. Top I can do with hand planes or files.

A number 2 round plane would probably do what you are talking about, though you may need to use a scraper or sandpaper to fair the parts where the radius meets the flats.