I decided to use a biscuit joiner
to make my corner joints. It may not be the best technique for such small wood, but this technique makes strong joints. I was concerned about creating sufficiently strong and rigid joints, and wanted to practice using my new biscuit joiner.
To prepare for biscuit cutting, first identify the size biscuit you'll use and where it will be located. The hole you cut will be slightly larger than the biscuit itself, so make sure you position the biscuit cut appropriately. Sketch in the location of the biscuit cuts, as they're another one of those points of no return.
Clamp your boards down firmly to your work surface, positioning them for proper attack by the biscuit joiner. Mine cuts horizontally, so I clamped the wood down as shown below. Since the pieces of wood are small I clamped two together to help support/stabilize the biscuit cutter, oriented such that I could cut the outside edge of both pieces.