I have one of those big plastic cutting boards. It is a pain to wash, rinse and store this sized cutting board. I wanted something smaller for a quick onion or pepper chop so I decided to make one.
This is made from Maple scraps I had laying in the shop. I used yellow glue. (I highly recommend using a waterproof or outdoor type glue) and finished with a food safe wood finish.
Step 1: Cut and mill your lumber
I cut 6 pieces about 1.25" wide 1" thick and about 10" long. My table saw is square enough and my blade was sharp enough to get these square, the first time around :)
All of these dimensions are based solely on what I had in the scrap pile and the size I had in mind, so go crazy if you want . Most all regular cutting boards are made in the same fashion.
Step 2: Glue the boards and clamp it up
Wood has a tendency to warp with moisture and time working against it. When gluing a wood board to another along the edge, it is a good idea to flip the direction of the grain every other board. What that means is, when looking at the end-grain of each individual board look at the direction of the tree rings and mark with a "U" on the end. After you mark each board make every other "U" upside down before glueing and clamping.
After you have your boards lined up, it is time to break out the glue and clamps.
Glue the boards edge to edge and clamp it all up. Try to get all the boards as flat as possible with one-another. This will make things much easier later on...
Let it sit for at least 2-4 hours before you un-clamp the board.