How thick are these boards. I seem to have missed it above. The procedure for 1/2" thick would be different than for 2" thick. For 3/4", which seems to be the assumption above, most of the methods would work. It depends on what tools you have and what you feel comfortable doing. I'd probably run a chisel on both faces then use a LA block plane to clean it up. But the other solutions would work too.
Allen