Most woodworkers know of glue-joint bits and drawer-lock bits. But there’s a form of the glue-joint bit that’s scaled for thin stock. And it will cut joinery for assembling drawer boxes.
You ought to get to know this little cutter. Use it to mill adjoining edges of 1/2" stock when making drawer boxes. The advantage in this is that the joint — so long as it is properly cut — forces the faces of adjoining boards to come flush as you clamp them.
Beyond that, use the bit to cut a drawer-lock joint that I believe is stronger than the conventional routed drawer lock. In addition to the interlocking tabs of the conventional joint, this one has an extra shoulder or two that can give the joint just a little extra resistance to racking stress.